# why does the equation x^2=-9 has no real solution why does the equation x^2 = 9 has two solutions

56,329 questions, page 151-
## Trigonometry

The function in the graph has the general equation f(x)=asin(bx+c)+d. Which of the following values are correct? Select all that apply d=-3 C=-1 B=0.5 B=0.5 D=1 A=2 B=2

*asked by Micheal on March 7, 2018* -
## Math/Algebra

Find the standard equation of an ellipse with the given characteristics and sketch the graph. Vertices at (0,-5), and (0,5); Foci at (0,-4)and (0,4).

*asked by M on May 26, 2013* -
## Algebra

I've been stuck on this for a while. State whether the equation is true false or an open sentence. Show your work. 3(4+-5)=3(-6-2)

*asked by Peach on May 23, 2015* -
## Chemistry HELP!

What is the translating word equation for water decomposes to form hydrogen oxygen gases?

*asked by Student08 on March 11, 2008* -
## college algebra

Solve the exponential equation. Express your solutions in exact form only. Please show all of your work. 3^x-70*3^-x=9

*asked by Sunny on January 4, 2012* -
## Math

Write an equation of the line satisfying the given conditions. Slope=0 y-intercept of 7. My answer is: y=7x Is this correct? Thanks.

*asked by B.B. on September 20, 2009* -
## chemistry

balance the equation and name the reaction taking place C3H5OH+O2 equals CO2+ H2O

*asked by patricia purnell on May 13, 2013* -
## chemistry

write the net ionic equation of the following reaction: HCl(aq)+NaOH(aq)--> NaCl(aq)+H2O(l)

*asked by Sid on January 3, 2012* -
## calculus

Does any tangent to the curve y=ãx cross the x-axis at x= -1? If so, find an equation for the line and the point of tangency. If not, why not?

*asked by natalia on March 1, 2010* -
## chemistry

Balanced equation for Oxidation-Reduction reaction for Ho2 + Cr(OH)3 = CrO4 + OH. Please show your work

*asked by Danyelle on April 2, 2011* -
## math

What is the value of x in the equation x/2+x/6=2 I found a common denominater of 6 3x/6+x/6=2 4x/6=2 mult. both sides by 6/1 and you get 4x=12 so x=12/4 or x=3 Is this correct/ Thanks for checking my work

*asked by B8 on October 18, 2013* -
## Algebra

Determine the equation of the line containing the points (-2,5) and (-1,6) f) y = x + 7 g) y = -x + 5 h) y = -x + 7 j) y = 1/3x + 19/3 k) y = x + 5 I know it must be either f) or k), because I figured out that the slope is 1. But it never mentions about

*asked by Cassie on March 4, 2009* -
## maths

x^2 + xy - Ky^2=0 , the angle made by the line pairs of this equation is 45 degree. I got the value of k as 0 and -2, do we need to reject k=0 and conclude our answer as k=-2 ?

*asked by clive on April 7, 2016* -
## algebra

factorise the left hand side of the equation xxx+7xx-21x-27=0 and the roots are

*asked by rinku on April 9, 2013* -
## math please help me

Write the standard equation of the ellipse with the given characteristics I have no ideal how to do this Center:(0,0) foci: (2,0) (-2,0) vertices:(5,0) (-5,0)

*asked by Ajay on May 7, 2012* -
## algebra

Determine whether y varies directly with x, If so, find the constant of variation k and write the equation. x y 4 6.4 7 11.2 10 16 13 20.8 Would like for someone to explain if possible

*asked by jay on September 10, 2012* -
## Calc.

For the function ƒ(x) = x^3 - 8x + 3, calculate where a = 5 and h = 2. Simplify before substitution (the simplifying is where I am having problems...not sure if my answer is right). Thanks. Using the limits equation.

*asked by Derek on July 14, 2008* -
## Trigonometry (Math)

Can someone help me simplify this equation? It needs to be ten characters or less, including signs, parenthesis, etc. If you could show me how you get there that would be great! Thanks!

*asked by Brianna on May 9, 2012* -
## calculus

Calculate the equation of the tangent and normal lines for the curve f(x) = tan 2x, at the point where the x-coordinate is: x = π/8.

*asked by Bonaventutre on March 27, 2013* -
## Math

Find the number that completes the equation. 6/5 divided by blank equals 6 IDK How to solve this.

*asked by Snowstorm on January 11, 2019* -
## math

Write and solve an equation to find the complement of an angle that measures 42 degrees. THX!

*asked by Sam on February 27, 2015* -
## Math

Find an equation of the line that bisects the obtuse angles formed by the lines with equations 3x-y=1 and x+y=-2. a. (3√2 +√10)x-(√10 + √2)y-2√10+√2=0 b. (3√2 - √10)x+(√10 - √2)y+2√10+√2=0 c. (3√2 + √10)x+(√10 - √2)y+2√10

*asked by Sophie on June 2, 2009* -
## math

I'm completely lost withhow u solve this quadratic equation using the square root method 6x^2=1

*asked by Jason on April 18, 2010* -
## Chemistry

What is a balance equation for sulphuric acid and copper oxide and please explain how you got the correct answer.

*asked by Jose-Ann on March 11, 2010* -
## Algebra

Write an equation for a parabola with a vertex at the origin and a focus at ( -4,0 ). a) 𝑦 = −1/4𝑥2 b) 𝑦 = − 1/16x2 c) 𝑥 = − 1/4y2 d) 𝑥 = −1/16y2 I think it's A. Any help?

*asked by Sandy East Ward on May 25, 2016* -
## chemistry

When you set up the ICE chart, are you supposed to bring the 0.05 to the product side to give you an equation of x^2 / x - 0.05?

*asked by THOMAS on July 12, 2010* -
## chem

can u help me write a word equation for the electrolysis of water , and indicate physical states and conditions of the reaction

*asked by juan on May 29, 2008* -
## physics

How much charge passes through a cross-sectional area of a copper wire in 0.8 s if I = 3.5 A? 1 C -Work equation?

*asked by Alice on May 11, 2012* -
## science

how do you write the chemical equation for liquid pentanol (C5H12O) and gaseous oxygen ? Thanks ~Samantha~

*asked by Samantha on November 29, 2010* -
## Algebra II

Solve each logarithmic equation. Check for extraneous solutions log42 = log21 +log(x-1)

*asked by Austin on April 15, 2019* -
## trig

simplify and write the trigonometric equation in terms of sine and cosine. tan^2x-sec^2x

*asked by Natash on November 15, 2008* -
## math-geometry

we have a test tomorrow and she said that a problem like this is going to be on there how do you do it???? Consider the parabola that passes through the points (2,6)(-1,12) and (0,6) Find the equation and the vertex

*asked by janet! on February 24, 2010* -
## math

I have an equation: 2x + 3 = 11 is this correct? x = 4? Can you show me the workings Yup 2x + 3 = 11 Subtract 3 from each side, and you get 2x = 8 Divide both sides by 2, and you get x = 4. =)

*asked by claudia on May 14, 2007* -
## Algebra

What were the headlines after a 3 foot 10 inch fortuneteller escaped from jail? Its an inequality equation like 3(2x + 5)=39 and 11(4-6y) + 5(13y+ 1)=9. Please Help Me with this!

*asked by Anonymous on April 14, 2016* -
## chemistry

if my molality is 1.08 m and my mass of unknown is 25 g. then how would i find my molecular weight of known. you don't have to solve it for me. what equation do i have to use

*asked by Anonymous on January 31, 2009* -
## chemistry

State one method of preparing oxygen in the lab and wrte a balanced equation for the reaction

*asked by +2347034420247 on March 11, 2010* -
## Chemistry

In the equation 2 NaN3----2 Na + 3 N2// how much N2 would be produced if 100 grams of NaN2 completely reacted at STP?

*asked by Lisa on April 10, 2016* -
## Science

What will the sound of speed be in air if temp is 10 degrees Celsius.this is crickets looking for e plantation on equation

*asked by Lucy on March 4, 2015* -
## chem

Balance the following equation by entering the correct coefficients. NaHCO3 --> Na2CO3 + H2O + CO2

*asked by will.i.am on January 8, 2013* -
## Algebra

State whether each equation represents a linear, quadratic, or exponential function. Tell how you decided. 1. y = 9^3x + 4 2. 4x = 5 - y 3. y = 2x^2 + 23 – 14x

*asked by Matt on October 26, 2009* -
## maths-

A and B are two different values of C lying between 0 and 360 which satisfy the equation (p cosC + q sinC=r) then prove that cos(A+B)=(p^2- q^2)/(p^2+ q^2)

*asked by anoynomous on April 9, 2013* -
## algebra

what are extraneous solutions of an equation? Why do they sometimes occur in the process of solving rational equations? examples

*asked by sid on March 26, 2010* -
## pre calculus

Solve the exponential equation Express you solutions in exact form only Please show your work e^2x - 9e^x - 20 = 2

*asked by anon on December 20, 2011* -
## Algebra

Write the equation of the line that passes through point (6,7) with a slope of 0. Am I in the right direction? y=mx+b I know everything except y, so I just plug in...y=0(6)+7 Anwser: y=7?

*asked by Bee on August 24, 2007* -
## algebra

(35) I need to determine equation of g(x) that results from translating function f(x) = x^2 + 3 and upward 7 units please help me by showing steps thank you

*asked by Alaska Diamond on September 22, 2013* -
## Analytical Chemistry

What is the balanced equation for oxidation of iodide ion by oxygen (O2) that occurs which produces iodine.

*asked by kalynn on January 30, 2012* -
## algebra 1

which equation models an exponential decay y=1/4x500^x 1/3y=6x100^x y=0.5x8^x y=23x(1/2)^x y=0.004x2^x i think it is d

*asked by Anonymous on March 26, 2013* -
## Calculus

The function h(x) = x^3+bx+d has a critical point at (2,-4). Determine the constants b and d and find the equation of h(x). Show your work.

*asked by Daniel on January 2, 2015* -
## maths

r=1-rcos(theta)convert into rectangular equation? r with cos creating trouble for me how to solve this?

*asked by Asfand on November 29, 2016* -
## trig

prove that the equation 2sin x cos x +4cos^2 x =1 may be written in the form of tan^2 x -2tan x -3=0

*asked by Nus on January 3, 2015* -
## chem

barium nitrate and sodium sulfate combine to create: write the balanced equation

*asked by auds on February 7, 2012* -
## science

In the following equation , 417.96 g of Bi reacts completely with 200 g of F . How many grams of BIF (to the third power) are formed?

*asked by chels on November 29, 2016* -
## Chemistry

What is the wavelenght of radiation of 1.50X1013Hz? The wave equation will find this: frequency*wavelength=speedoflight

*asked by Anonymous on October 24, 2006* -
## algebra

Solve the equation or formula for the indicated variable S=5rTf foRT answers are T=s/5-r,, T=25r/s,, T=r2-5s,, T=s/5r2

*asked by Tammy on February 25, 2014* -
## chemistry

What is the is product of Nickel(II) nitrate+sodium phosphate This is what I have: Ni(NO3)2+Na3PO4----> can you help me on the resultant equation please

*asked by julie on January 8, 2008* -
## Algebra

Suppose that y varies directly with x and inversely with zy=25 when x=35, and z=7. Write the equation that models the relationship. Then find y when x=12 and z=4 Help me!?

*asked by Kat on June 12, 2011* -
## algebra

How do i find the transformed equation of the hyperbola xy = 4 when rotated 45 degrees? I don't understand at all. my choices are: A - (x')²(y')² = 4 B - (x')² - (y')² = 4 C - (x')² - (y')² = 8

*asked by hopple on March 29, 2010* -
## ALGEBRA 1

Determine the equation of combined, then solve for the missing value. Variation x varies directly with y and z. x=5 when y=10 and z=5. find x when y=20 and z=10

*asked by Bobby Jones on September 30, 2012* -
## trig

solve equation for the exact solutions if possible put answer in degrees. 2tanx/3-tan^2x=1

*asked by jeff on May 30, 2012* -
## Algebra

find the vertex, line of symmetry, and minimum or maxium values of the quadratic equation f(x)=9-x^2

*asked by Jess on June 15, 2011* -
## Chemistry

Complete and balance the chemical equation. Be sure to include the states of the reactants and products. SO2(g)+O2(g) → thanks

*asked by James on May 4, 2012* -
## math

Can someone explain this to me please? Write the equation of the line with x-intercept (–9, 0) and undefined slope. Here are my options for answers: A) y = –9 B) x = –9 C) y = –9x D) x = 0

*asked by Undefined Slope on November 25, 2007* -
## chemistry

Write net ionic equation for the reaction between nitric acid and calcium hydroxide.

*asked by ivy on February 10, 2012* -
## Math

write an equation in standard form of the parabola that has the same shape as the graph of f(x)-7x squared, but which has a maximum of 9 at x=3.

*asked by WANLDA on November 10, 2009* -
## math

setup an equation or expression to model the situation: a rectangle that would fit inside of the curve y=-x^2+8

*asked by sam on September 3, 2012* -
## science

What would be the equation for Drano which is made by combining Sodium Hydroxide NaOH and Water H2O?

*asked by teacher1 on February 21, 2013* -
## chemistry

what two conditions must be met by a thermochemical equation so that its standard enthalpy change can be given the symbol delta Hf?

*asked by Leslie on October 12, 2010* -
## Algebra

Find the equation of the line passing through (-1,2) and parallel to y=2x-1. I don't understand how to figure out this problem. Thank you! :-)

*asked by Cassie on April 22, 2009* -
## Physics

Hi, I am in the middle of a physics lab about sound resonance, but I have no idea what "n" stands for in the equation we have to use, which is L=(2n-1)(wavelength)/4 any help? thanks!

*asked by Robin on June 27, 2011* -
## Chemistry

Consider the following equation: 4B(s) + 3O2 (g) → 2B2O3 (s) ΔH = - 2509.1 kJ How much heat (in kJ) is transferred when 989 mg of B2O3 (s) is formed?

*asked by Sarah on December 1, 2014* -
## chemistry

Examine the unbalanced electrolytic reaction. Li+(aq) + Zn(s) → Li(s) + Zn2+(aq) How many electrons are transferred in the balanced equation? 4 1 2 3

*asked by madison on June 8, 2018* -
## Pre-Calculus

Find the inverse of the following quadratic equation. Hint: Complete the square first. y= 2x²+16x-5

*asked by AwesomeGuy on March 7, 2013* -
## Pre Calculus

Write the equation 5^2= 25 in logarithmic form. a. log255=2 b. log25=25 c. log52=25 d. log225=5 e. log525=2

*asked by Jessica Maths on July 6, 2016* -
## MATH

Find an equation of the tangent plane to the given parametric surface at the specified point. r(u, v) = u cos vi + u sin vj + vk; u = 7, v = π/3

*asked by Taylor on November 16, 2016* -
## Algebra 1

Write an equation in standard form for the line through (9, -2) and (13, -8) Do I solve this by doing y2-y1/x2-x1. That would give me the slope and then plug in the 13 for the x and -8 for the y?

*asked by Elisa on September 29, 2009* -
## Calculus

Find an equation (in terms of x and y) of the tangent line to the curve r=3sin(5theta) at theta=pi/3

*asked by help on February 21, 2012* -
## Chemistry

What is the coefficient in front of carbon dioxide when the following equation is balanced? C3H8(l) + O2(g) → H2O(g) + CO2(g) a. 1 b. 3 c. 5 d. 6

*asked by Adryan on December 6, 2011* -
## chemistry

how do I know the ion value of elements on the production side of the equation when balancing with the electron transfer method?

*asked by stephanie on November 14, 2007* -
## chemistry

Hi I was wondering if this equation is reversible and be written lime this: NaNO3 + H2O ⇋ NaOH + HNO3 Thanks!

*asked by Sherlique on December 21, 2016* -
## chem

Balance the following redox equation by the oxidation number methode Ag + HNO3 = AgNO3 + NO + H2O

*asked by Amber on May 25, 2011* -
## Government secondry school gwagwalada

Consider the equation N2(g)+3NH2(g)---2NH3.what is the needed volume of nitrogen to react with 15cm3 of hydrogen?

*asked by Abdullahi on April 10, 2013* -
## science

balance any 25 chemical equation and write the name of the reactant and the product. mention the catalist when ever required.

*asked by priya on June 19, 2010* -
## Math

The equation xy-1=x+y^2 defines a function y=f(x) in a neighborhood of (-1,0). Determine f(-1), fx(-1), and fxx(-1) and the second -taylor polynomial t2 (x) based around x=-1

*asked by Mike on April 24, 2019* -
## math

can some one help me ... determind the equation of g(x) that results translating the funtion f(x)=x^2 +19 upward 15 units,,,, the answere im stuck is not sure g(x)=x^2+24 0r is it g(x)=(x+15)^2 +9

*asked by WINSTON on March 8, 2014* -
## math

Find the equation of a hyperbola which is generated by a point that moves so that the difference of its distance from the points (-4,1) and (2,1) is 4.

*asked by coni on December 17, 2008* -
## Chemistry

Hey, can you help me balance this equation? Cu2S + HNO3 --> Cu(NO3)2 + CuSO4 + NO2 +H2O Thanks!

*asked by Matt on January 24, 2008* -
## Algebra

Suppose that Y varies directly with X, and Y=4 when X=16 (a) Write a direct variation equation that relates X and Y (b) Find Y when X=3

*asked by Anonymous on March 13, 2016* -
## math

find the equation of a straight line which is equidistant from the points(2,3) and (6,1) expressing it in the form ax+by=c where a,b and c are constants.

*asked by Austin on November 26, 2018* -
## vector calculus

Hi, I'm having trouble answering this question. The lines l1 and l2 are defined as l1: (x-1)/3 = (y-5)/2 = (z-12)/-2 l2: (x-1)/8 = (y-5)/11 = (z-12)/6 The plane j contains both l1 and l2. Find the Cartesian equation of j.

*asked by greg on April 18, 2017* -
## Chemistry

Balance both the atoms and charges of the following chemical equation: Ce4+ + S2 −→ Ce3+ + S This is what I came up with: 3Ce4+ + S2 −→ 4Ce3+ + 2S

*asked by Mariah on July 1, 2016* -
## calculus

The voltage (V) applied to a 0.25 F capacitor is given by the equation : v= (t^2-2t)^3/5t Find the current at t = 3.7 s. (i=C dv/dt) Round to 3 significant figures

*asked by Preet on November 26, 2012* -
## Chemistry

What is the net ionic equation for this reaction? 2MnO4 (aq) + 5H2C2O4 (aq) + 6H(aq)----->10CO2 (g) + 2Mn(aq) + 8H2O(l)

*asked by Sara on January 16, 2012* -
## Algebra

Find the equation of the line passing through (-1,2) and parallel to y=2x-1. I don't understand how to figure out this problem. Thank you! :-)

*asked by Cassie on April 22, 2009* -
## algebral

What is the electromagnetic flux coming from the surface of a 5000K blackbody? I am supposed to use maxwells equation.

*asked by james on March 19, 2011* -
## Gen Chem

n = 6 and E° = 0.011v for a redox reaction with Q = 7.03 x 10-1. Calculate E. Assume T = 298.15K. How do I set this equation up?

*asked by Sarah H on March 28, 2008* -
## Math

Use the information provided to write the vertex form equation of each parabola. a)y + 60x + 294 = -3x^2 b)−(y+1) = (x−4)^2

*asked by Kate on July 27, 2011* -
## math algebra

Fill in the missing numbers to complete the linear equation that gives the rule for this table. x y 2 22 3 33 4 44 5 55 y = x + Submit

*asked by jaz on June 15, 2017* -
## Math

Find all solutions of the given equation in the interval [0, 2pi) cos x/2 - sin x = 0 Hi, I am struggling with this question. Can anybody help me please? Thanks!

*asked by Lottie on July 12, 2016* -
## Algebra

f(x)=1-x^2. Looking for the vertex and an equation of the line of symmetry. f(x)=-x^2+5x+36 Looking for the x, and Y coordinates. I seem to be entering the answers backwards, cannot understand. Please help.

*asked by Maria1 on April 26, 2012* -
## math/algerbra

Which of the following points would fall on the line produced by the point-slope form equation y + 4 = 2(x - 3) when graphed?

*asked by ariel on February 12, 2019*

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