# 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 414
1. ## bluehills high school

general solution 1-cos2x/4cos(90)

asked by lebo on November 6, 2015
2. ## algabra

Solve and graph the solution set.

asked by edie on August 19, 2007
3. ## Algebra 1

Find the solution to the system y=x^2-2x-2 My answer is (-1,1)(7,33)

asked by Steve on March 30, 2015
4. ## chemistry

What are the concentrations of H3O+ and OH- and what is the pH of a 0.15 M solution of Na2CO3 (at 25 °C).

asked by darren on March 15, 2011
5. ## chemistry

What weight of Ca(OH)2 is necessary to prepare 3,500ml of 0.7M of Ca(OH)2 solution?

asked by jen on August 26, 2018
6. ## CHEMISTRY

How to determine the molarity of a 1.8% NaCl solution.

asked by BILL on February 24, 2011
7. ## Algebra

x^2-25 over x^2+7x, divided by x^2+7x+10 over x^2+9x+14. I found the solution to be x-5 over x, is this correct?

asked by Anonymous on September 23, 2009
8. ## college chem

PLEASE..Determine [OH-]of a solution that is 0.270 M in HCO3-...thanks

asked by susy on April 9, 2010
9. ## Science

0.02mole of the HCL and in 2leter of the pH solution

asked by Anonymous on August 20, 2018
10. ## Chemistry

Calculate the pH of a solution at 25.0 °C that contains 1.94 × 10-10 M hydronium ions.

asked by JOHN on November 17, 2012
11. ## maths-Linear inequations

Find the solution (feasible) of following inequations x+ 4y ≤ 24; 3x +y ≤21 ; x+ y ≤9; x≥0 and y≥0

asked by anoynomous on March 22, 2013
12. ## Chemistry

What is the pH of a 2.5 x 10-2 M HCl solution? I'm so confused how to find this :(

asked by Jess on April 24, 2012
13. ## trigonometry

Find the general solution for f(x) = 27 tan^2 x-9=0

asked by lindsay on April 23, 2012
14. ## Algebra

Graph the system below and write its solution. =3x+y−6 =y−1/2x-1

asked by Anonymous on October 9, 2014
15. ## math

Solve system of equations x+3y=7 (1) x=8-3y (2) no solution

asked by deedra on January 7, 2009
16. ## Government

Looking for an issue and a solution where the people and the government can help

asked by Em on September 5, 2013
17. ## math

Use the solution of the system below to find x-y: 4x-2y=11 3x-4y=-6 a 11.3 b 0.1 c -0.1 d -11.3 please explain how to do this. Thanks!!!

asked by Anonymous on March 26, 2009
18. ## algebra

Is it possible to have different quadratic equations with the same solution? Explain.

asked by becky on March 2, 2008
19. ## Chemistry

What is the concentration of H+ in a solution containing 73.0 g of HCl in 0.5 L of water?

asked by Sarah on May 10, 2012
20. ## Math

Identify the extraneous solution when solving √x+2= x

asked by I DONT UNDERSTAND on April 5, 2014
21. ## Chemistry

The pH of a .200M HBrO solution is 4.67. What is the acids Ka?

asked by Shayla on May 9, 2014
22. ## Chemistry

What is the pOH of the solution in the question I asked before this one?

asked by Emma on February 26, 2014
23. ## Chemistry

Calculate the pH of a solution at 25.0 °C that contains 1.94 × 10-10 M hydronium ions.

asked by Josh G. on November 16, 2012
24. ## chemistry

What is solubility of CaF2 in a solution buffered at pH 5

asked by Karen on March 31, 2008
25. ## Math

Identify the solution of the system of equations -3x-4y=2 8y=6x-4

asked by Felicia Chase on April 21, 2014
26. ## algebra

Solve by completing the square x^2+3/2x=3 What is the solution? x=

asked by Becky on March 11, 2008
27. ## Algebra 1

Hi, What point is a solution to the system of inequalities y >4x and y >-2x-3 (1/2,2)?

asked by Batman on June 26, 2013
28. ## chemistry

50 mL of 1.50* 10^-2 M HI(aq) is mixed with 75.00 mL of 1.10* 10^-2 M KOH(aq). What is the pH of the Final solution

asked by reena on February 16, 2009
29. ## chemistry

What is pH of 0.1M solution of NH4Br, if the pKb of NH3 is 4.74?

asked by Henry on November 9, 2012
30. ## Math

Identify the extraneous solution when solving √x+2= x

31. ## Math

a and b are integers such that the polynomial f(x)=x^4−4x^3−8x^2+ax+b has 1+2i as a solution to f(x)=0. What is the value of 10a+b?

asked by Crow on June 10, 2013
32. ## eng1511

The sure solution of unemployment is a better quality of education

asked by amanda on March 11, 2013
33. ## Math 116 algebra please check

Solve for the indicated letter. e=9f, for f The solution is f = 1/9e Please check this

asked by jay jay on July 16, 2008
34. ## Algebra 1

Solve 2x^2 + 7x = -8 using the Quadratic Formula. A: No solution?

asked by Victoria on May 13, 2014
35. ## Chemistry

How do you find the [OH-] of a 1x10^-3 M solution of NH4Cl?

asked by Linda on February 20, 2014
36. ## algebra 2

which point is a solution to the following systems of inequalites -4x+ 5y> 20 8x + 3y < 24

asked by gege on May 11, 2013
37. ## math

x+5y - 6z = 2 kx +y -z = 3 5x -ky +3z =7 For what values of k does the system have a unique solution

asked by Anonymous on August 13, 2012
38. ## Math

solve by the elimination method 5u+3v=-17, 2u+v=-7 would there be a solution or not?

asked by tootles on February 8, 2013
39. ## chemistry

What is the pH of a 100g/l solution of potassium cyanide?

asked by Joe Price on October 30, 2014
40. ## Anatomy and Physiology

If one solution is 1000 x as acidic as another, how many pH units would there be between the two?

asked by Molly on July 26, 2012
41. ## chem

what is the pH of an aqueous solution that is 0.123M NH4Cl

asked by help!!! on February 16, 2009
42. ## cant figure out

Solve by the substitution method. 7x+3y=1 AND -4X+Y=13 What is the solution.

asked by tera on February 10, 2009
43. ## Chemistry

What is the % mass/volume of a 3.00 M solution of NaCl?

asked by ASAP!! on May 6, 2014
44. ## Math

When solving a system algebraically how can you tell if there is no solution

asked by Taylor on February 17, 2014
45. ## math

Given that x = 2log t is a solution of the equation10^(2x+1) -7(10^x) -26 =0. Find t

asked by lindsay on July 10, 2014
46. ## Differential Equation

Find the general solution of y"-3y=8e^(3t)+4sint

asked by Maegan on July 14, 2012
47. ## Chemistry

What is the pH of a solution of 0.1 M silver hydroxide, which is only 10% ionized?

asked by Sarah on May 10, 2012
48. ## Chemistry

What is the % mass/volume of a 3.00 M solution of NaCl?

asked by Sudana on May 6, 2014
49. ## maths

the solution set for the following 1.X3+x2-6x-10=0 2.2x2-4x-4=0 3.x4-x3-4x2+x+1=0

asked by Laila on October 8, 2013
50. ## chemistry

what is the pH of a NaOH solution whose concentraiton is 4.5 * 10^-5 M. HOW WOULD I DO THIS PROBLEM??

asked by Miley on May 15, 2008
51. ## Math

Which of the following equations has an infinite number of solution? A. 3x - 3 = 4 -4x B. 2y + 4 - y = 16 C. 7x + 5 = 4x + 5 +3x D. 6y - 2 = 2 (y-1)

asked by SandpitTurtle on January 17, 2014
52. ## Chemistry

Propanoic acid has a Ka of 1.3 x 10^-5. What is the % ionization in a 3.0M solution?

asked by Lily on May 22, 2012
53. ## Algebra

Identify the solution(s) of the system of equations 9x + 2y = 6 8x - 2y = 8

asked by Monica on June 4, 2013
54. ## Algebra

Identify the solution(s) of the system of equations 3x+2y=4 5x-4y=3

asked by Monica on June 4, 2013
55. ## math

How many grams of a drug are contained in 1L of a 30% solution?

asked by Anonymous on September 28, 2012
56. ## Chemistry

Calculate the pH of a 5.90x10-3 M solution of H2SO4.

asked by Chris on March 5, 2012
57. ## Chemistry

What is the molarity of a 5.00 x 102 ml solution containing 2490 g of KI?

asked by Victoria on August 18, 2013
58. ## general chemistry

Calculate the molarity of each of the following solutions.70.8 in 2.51 of solution

asked by kelia on March 7, 2013
59. ## Math

What is the solution for the following system of linear equations? x + 6y = -4 3x - 4y = 10

asked by Susie on May 30, 2008
60. ## Algebra

I am completely lost...please anyone can anyone help? x = 2+y x and 2 are in inches then it says solution y=x(in) - a(in)

asked by George on September 1, 2013
61. ## algerbra

Identify the solution(s) of the system of equations, if any. 6x + 4y = 0 y = 3 - 3x (–3, –2) (–3, 2) (–2, –3) (2, –3)

asked by robert on September 8, 2014
62. ## Math 116 algebra please check

solve using the multiplication principle. -5/6x = -7/8 Th solution is x=21/20

asked by jay jay on July 16, 2008
63. ## algebra

Solve the inequality graph solution 5r+4

asked by Tammy on February 25, 2014
64. ## math

Identify the solution(s) of the system of equations, if any. 2x + 5y =10 Y = 2 – x a) (-2,0) b) (2,0) c) (0,-2) d) (0,2)

asked by monet on January 27, 2013
65. ## Math

Identify the solution of the system of equations 9x+2y=8 8x-2y=8

asked by Felicia Chase on April 21, 2014
66. ## analytical chemistry

How much NaOH (in grams) would there be in 0.25 litre of a 0.3M solution?

asked by MJ on February 15, 2014
67. ## Chemistry

Calculate the [h30+] in a 0.010M solution of Sr(OH)2

asked by Saphire on April 25, 2012
68. ## Chemistry

Assuming complete dissociation, what is the pH of a 2.55 mg/L Ba(OH)2 solution?

asked by Joe on March 23, 2013
69. ## Math 116

Identify the solution (s) of the system of equations, if any. 2x+4y=11 y=5-5x a. (2.5,-0.5) b. (2.5,0.5) c. (-0.5,2.5) d. (0.5,2.5)

asked by Queta on June 21, 2013
70. ## CHEMISTRY

What is the [H+] in a 0.10 M solution of ascorbic acid,C6H8O6?

asked by James on April 25, 2012
71. ## Differential Equations

y'=2x+y. Find a solution whose graph is also an isocline.

asked by Brian on February 14, 2013
72. ## Algebra

find the solution set for -x^2=-64x

asked by Anonymous on March 6, 2013
73. ## math

What is the molarity of a 15%w/v HCl solution (GMW=36.46)?

asked by tiffany on June 17, 2013
74. ## maths

using buttons of different colours ,find the solution of 5x-6=9

asked by abhigyan on June 17, 2013
75. ## Algebra

Determine if (-4/5,3) is a solution to -5x+7y=25. Show work

asked by Rand on April 25, 2012
76. ## math

Identify the solution(s) of the system of equations, if any. 6x + 4y = 0 y = 3 - 3x (–3, –2) (–3, 2) (–2, –3) (2, –3)

asked by robert on September 8, 2014
77. ## chemistry

How many osmoles are there in 6.00 ML of a 6.0 N mg3(po4)2 solution?

asked by Nicole on December 5, 2012
78. ## Math 116

Identify the solution (s) of the system of equations, if any. x+3y=5 6x-6y=14 a. (3,3/2) b.(3,2/3) c.(3/2,3) d. (2/3,3)

asked by Queta on June 21, 2013
79. ## Chemistry

what is the pH solution in which 15 mL of 0.10 M NaOH has been added to 25 mL of 0.10 M HCl

asked by Veronica on June 10, 2014
80. ## math

Identify the solution(s) of the system of equations, if any. 6x + 4y = 0 y = 3 - 3x

asked by robert on September 8, 2014
81. ## math

Identify the solution(s) of the system of equations, if any. x + 3y = 7 6x - 9y = 6

asked by robert on September 8, 2014
82. ## math

the solution is (2/3,-1/2)(-3,-8) and he formula is f(x)=mx+b given the slope and one point

asked by valentine on August 5, 2014
83. ## Franklin High

4x - y = 2, 9x - 2y = 8 find solution by substitution method

asked by liz on June 12, 2013
84. ## Chemistry Web Quest

How do you recover the dissolved solid in a solution?

asked by Lyne on February 13, 2009
85. ## Chemistry

how can you prepare 300ml of 15% h2so4 solution

asked by rone on February 18, 2013
86. ## math

Use the solution of the system below to find x-y: 4x-2y=11 3x-4y=-6 a 11.3 b 0.1 c -0.1 d -11.3 please explin how to do this. Thanks!!!

asked by Anonymous on March 26, 2009
87. ## math

the ph of a solution is 3.6 what is it hydrogen ion concentration

asked by i need help on December 9, 2012
88. ## science

dilution of a vinegar solution 10x?

asked by judalyn on May 27, 2014
89. ## algebra

graph the system and write the solution -2x+y=6 y=1/2+3

asked by Anonymous on March 7, 2013
90. ## math

how many grams of NaC1 are in 100mL of NS solution?

asked by karen on March 14, 2009
91. ## Math

Tell Whethter the givin number is a solution of -5 < n. 3. 8 4. -8 5. -4 6. 4

asked by Dejon on January 10, 2009
92. ## math

Use quadratic formula (3x/x-1)+(2/x)=4 the solution set is ( , )

asked by Anonymous. on August 23, 2014
93. ## Inorganic Chemistry

1) 5.0 mL of 6.0 x 10^-4 potassium 5.0 mL of the solution prepared above are then mixed with

asked by Katheryn on July 30, 2012
94. ## math

Identify the solution(s) of the system of equations, if any. X + 2y = 4 9x – 4y = 3 a) (1, 2/3) b) (1, 3/2) c) (2/3, 1) d) (3/2,1)

asked by monet on January 27, 2013
95. ## math

please help simplify (3y/x^4)^-3 1/(1+square root of a) what would be the best solution: (1)/(x-2) +8= (x)/(x-2)

asked by haley on April 7, 2012
96. ## chemistry

0.0386mol glucose in 88.0ml of solution

asked by cynthia on December 8, 2012
97. ## Chemistry 1301

How many g of NaOH are in 10 ml 0.1 M solution? How do you find this out, what are the steps?

98. ## Chemistry

i need help. Calculate the pH of a 0.24 M CoCl3 solution. The Ka value for Co(H2O)63+ is 1.0 10-5. how do u do these with like the Cl there?

asked by Lindsey on February 15, 2009
99. ## math

Identify the solution of the system of equations 3x+2y=4 5x-4y=3

asked by Felicia Chase on April 21, 2014
100. ## Chemistry

Prepare 250 cc n/10 KMno4 solution