# Consider the equation y=2x2+9x+1. When x=−1, what is the value of y?

30,780 results
1. ## Algebra

Solve. (–10x3 + 30x – 20) ÷ (–5x + 5) • 2x2 – 2x + 4 • –2x2 – 2x – 4 • –2x2 + 2x + 4 • 2x2 + 2x – 4 How?
2. ## Calc

The slope of a curve at each point (x,y) is given by 4x - 1. Which of the following is an equation for this curve if it passes through the point (-2,3)? A) y=4x²-x-15 B) y=x²-4x-9 C) y=2x²-x-7 D) y=2x²-x E) y=2x²-x+7
3. ## Algebra 2

If f(x)= x2 + 2x - 6 and g(x)= 3x2 - 5x - 7, find f(x)-g(x). A) -2x2 - 3x + 1 B) -2x2 + 7x + 1 C) -2x2 - 3x - 13 <my choice D) 4x2 - 3x - 13
4. ## Algebra

Determine the number of real-number solutions to the equation -2x2 - x - 5 = 0, given the graph of y = -2x2 - x - 5
5. ## math

(please solve step by step) solving equation (6x+2)/4 + (2x²-1)/(2x²+2) = (10x-1)/4x we got roots as
6. ## Algebra

If the sides perpendicular to the wall have length x feet, which of the following (A, B, C, or D) represents the area A of the garden? A(x) = –2x2 + 30x A(x) = –2x2 + 60x A(x) = x2 – 60x A(x) = 2x2 – 60x
7. ## Algebra2

Complete parts a – c for each quadratic function. a. Find the y-intercept, the equation of the axis of symmetry and the x-coordinate of the vertex. b. Make a table of values that includes the vertex. c. Use this information to graph the function. 1. f(x)
8. ## Algebra

When 3x2 – 2x + 1 is subtracted from 2x2 + 7x + 5, the result will be what? do I subtract 3x2 – 2x + 1 - 2x2 + 7x + 5 like this or 2x2 + 7x + 5 - 3x2 – 2x + 1 like this?
9. ## Math

Solve the quadratic equation 2x² - 4x + 1 = 0 How many solutions are in the equation 3x² + 4x - 7 = 0
10. ## Maths

Solve the quadratic equation 2x² - 4x + 1 = 0 How many solutions are in the equation 3x² + 4x - 7 = 0
11. ## algerba 1

Solve by graphing 1. 2x2-7x+5=0 2. 2x2+x-6=0
12. ## algebra

Did I do this problem the correct way if so is there a shorter way to explain this? x(x + 6)(x + -4) = 24x x(6 + x)(x + -4) = 24x x(6 + x)(-4 + x) = 24x (6 + x) * (-4 + x x(6(-4 + x) + x(-4 + x)) = 24x x((-4 * 6 + x * 6) + x(-4 + x)) = 24x x((-24 + 6x) +

1. What is the degree of the monomial 3x2y3? 2 3 5 6 2. What is the simplified form of 8b3c2 + 4b3c2? 12bc 12b3c2 12b6c4 12b9c4 3. What is the simplified form of (4j2 + 6) + (2j2 – 3) ? (1 point) (0) 6j2 – 3 (1) 6j2 + 3 (0) 6j2 + 9 (0) 4j4 + 3 4. What
14. ## Math

Solve: 1.) 2x² + 24 = x² The answers I obtained were: x = i√24 and x= -i√24 are these correct? 2.) 9x³ = 25x 3.) 5x² - x = 7x² - 5x - 2 4.) 2x² = x³ + 4x - 8 ~Thank you
15. ## math

Graph the quadratic functions y = -2x2 and y = -2x2 + 4 on a separate piece of paper. Using those graphs, compare and contrast the shape and position of the graphs.
16. ## algerba

What is the value of the discriminant, b2 − 4ac, for the quadratic equation 0 = −2x2 − 3x + 8, and what does it mean about the number of real solutions the equation has? What are the solutions to the quadratic equation 4(x + 2)2 = 36
17. ## Algebra

Given below are equations for 2 planes in R3. 3x1 − 2x2 = 10 x1 + 2x2 + 4x3 = −2 Explain why these two planes must intersect in a line.
18. ## math

graph y=x2,y=2x2 and y=1/2x2 on the same
19. ## math

Graph the quadratic functions y = -2x2 and y = -2x2 + 4 on a separate piece of paper. Using those graphs, compare and contrast the shape and position of the graphs. (3 points)
20. ## Algebra

Can someone help me solve this equation?/ [SQRT(2x2 + 5x + 6)]=x
21. ## Algebra

I need help doing this problem, should I not get the same answer with each technique? Please help. What three techniques can be used to solve a quadratic equation? Demonstrate these techniques on the equation: 2x² + 3x + 1 = 0
22. ## math-algebra 2

What are the solutions of the quadratic equation? 2x2 – 16x + 32 = 0
23. ## Math .. qustn re-post

If α and β are the root of the equation 2X²-7X-3=0 Find α ---- + 1 + β β ---- + 1 α
24. ## MATH

If α and β are the root of the equation 2X²-7X-3=0 Find α/β+1 + β/α+1 Working answer please
25. ## calculus

equation of the tangent line to the curve y = 2x²-x+10 at the point (-1,13)
26. ## Numerical Analysis

show that the equation xcosx-2x2+3x-1=0 has at least one solution in [0.2,0.3]
27. ## Algebra II

Explain, without doing any calculations, why there cannot be a Real solution to the equation p5 + 2x2 + 3px + 7 + 8 = -2:
28. ## PRECALC QUESTION

Solve for "x" and "y" given the following matrix equation: (2x, 0.5y, -2, 1) * (3, -2, 0, 1) = (-24, 19, -6, 5) (the matrices are going from left to right, they're all 2x2's.)
29. ## math

For questions 1 and 2, use integer values of x from –3 to 3 to graph the equation. 1.   y = –2x2 + 3  (1 point)
30. ## Math

For 1 and 2, use integer values of x from -3 to 3 to graph the equation (1) y = -2x2 + 3 (2x squared) (2) y = 1/3 |x| -2 (x is in absolute value)
31. ## Math

For questions 1 and 2, use integer values of x from –3 to 3 to graph the equation. 1. y = –2x2 + 3 (1 point)
32. ## Algebra

Where do you insert parenthesis to make this equation true: 3x5+4-2x2+6-4=15
33. ## Algebra

Which equation represents the axis of symmetry of the function y = –2x² + 4x –6? (1 point) y = 1 x = 1 x = 3 x = –3
34. ## algebra2

this equation represents the area of a rectangular chicken coop a=2x2-4x+2
35. ## Calculus

Determine the equation of the tangent line to the curve y = 2x²-1 at the point where x = -2
36. ## Algebra

A gardener has 60 feet of fencing with which to enclose a garden adjacent to a long existing wall. The gardener will use the wall for one side and the available fencing for the remaining three sides. (a) If the sides perpendicular to the wall have length x
37. ## Calculus

Which of the following is the general solution of the differential equation dy/dx = 2x/y? y2 = x2 + C y2 = 2x2 + C <- my answer y2 = 4x2 + C x2 − y2 = C
38. ## math

So is the function, f(x)= 2x²- 3x + 4 linear or nonlinear? Find f(-3) and f(3) for this function. I have the answer f(x)= 2(3)²- 3(3) + 4 =29 and f(x)= 2x²- 3x + 4 =49 I hapo this is correct and this is non linear?
39. ## math

The quadratic equation frequently appears in both the equilibrium and acid-base sections of General Chemistry. Therefore, it is useful to refresh the use of the quadratic before applying it to chemistry questions. Which of the following answers is a viable
40. ## Pre-Calculus

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

Write the system as a matrix equation and solve using inverses. x1 + 2x2 - x3 = -3 -2x1 - x2 + 3x3 = 0 -4x1 + 4x2 - x3 = -12 A. x1 = 2, x2 = -3, x3 = 1 B. x1 = 1, x2 = -2, x3 = 1 C. x1 = 1, x2 = -2, x3 = 0 D. x1 = 1, x2 = -3, x3 = 1
42. ## Algebra II

When asked to solve the rational equation 11/2x^2+x-15=5/2x-5-x/x+3 a student multiplied both sides of the equation by the expression (2x2+x−15)(2x−5)(x+3). Was this the best thing for the student to do? If not, what should the student have
43. ## Algebra 1b HELP

Consider the equation y=2x2+9x+1. When x=−1, what is the value of y? This question is a 'enter correct answer'. It doesn't give me any options. But, I did the math three times already, shouldn't Y=-10?
44. ## Algebra 2

Find the distance between the points (12, 8) and (4, 2). 100 units 14 units 10 units –10 units Find the midpoint of the points (3, 1) and (7, –5). (1, 6) (2, 1) (2, –3) (5, –2) Find the vertex and focus of the parabola whose equation is 4y = x2 +
45. ## AlgebraB-2

1. What are the coordinates of the vertex of the graph? Is it a maximum or minimum? 3. How is the graph of y = –2x2 – 4 different from the graph of y = –2x2? (1 point) 4. Graph the function. Identify the vertex and axis of symmetry.
46. ## math

State the solutions, or estimated solutions, to each quadratic equation in Exercises 23–26 by examining the graph of the related quadratic function equation 2x2 - 3x - 4 = 0 and Graph:y=2x^2-3x-4 Can someone help me with this
47. ## Maths (Linear and Quadratic Equations)

I need to solve a pair of equations where one is linear and the other is quadratic. 2x2 + 3xy + y2 = 0 3x + y = 2 last 2 in 2x2 is square root two, same after y2. help please!!!!!!!!!!!!!!!
48. ## science

1s2 2x2 2p6 3s2 3p6 is the electron configuration ofr for which ion? I believe your 2x2 should be 2s2. You have 18 electrons in filled orbitals. That could be a +1 charged element 19 (K+) or a +2 charged element 20 (Ca++) \, for example. In either case, it
49. ## Algebra 1

Lately I just have blacked out in my algebra 1 class. Here's a equation on my worksheet, and I would be happy if you could show in steps how you got your answer. Thank you. (2x²+5x+3)-(x²+2x+1)
50. ## algebra

Put the equation in the form ax2 + bx + c = 0. Enter exponents using the caret ( ^ ). For example, you would enter 4x2 as 4x^2. 8-2x2=(x+2)2-7
51. ## exact differential equation

(x2-4xy-2y2)dx+(y2-4xy-2x2)dy=0
52. ## math

write this equation in standard form. y=1/2x2+12x-8 y equals one half x squared plus 12x minus 8
53. ## Math

Find all values of 𝑐, so that the solutions of the following equation are real numbers 2x2 − 4𝑥 + 𝑐 = 0
54. ## Mathematics

Solve the quadratic equation 3x²=27 Solve the quadratic equation 2x² - 4x + 1 = 0
55. ## Algebra 2

Operations with Complex Numbers Simplify. 1. sqrt(-144) 2. sqrt(-64x^4) 3. sqrt(-13)*sqrt(-26) 4. (-2i)(-6i)(4i) 5. i13 6. i38 7. (5 – 2i) + (4 + 4i) 8. (3 – 4i) – (1 – 4i) 9. (3 + 4i)(3 – 4i) 10. (6 – 2i)(1 + i) 11. (4i)/(3+i) 12. (10+i)/(4-i)
56. ## Math

Find the augmented matrix for each of the following systems of linear equations: (a) 3x1 − 2x2 = −1 4x1 + 5x2 = 3 7x1 + 3x2 = 2 (b) 2x1 + 2x3 =1 3x1 − x2 + 4 x3 = 7 6x1 + x2 − x3 = 0 (c) x1 + 2x2 − x4 + x5 =1 3x2 + x3 −
57. ## math

find the axis of symmetry f(x)=-2x2-12x+8find the axis of symmetry f(x)=-2x2-12x+8
58. ## Algebra

Directions: Find the prime factors of the polynomials 1. a. 2a2 - 2b2 b. 6x2 - 6y2 c. 4x2 - 4 d. ax2 - ay2 e. cm2 - cn2 2. f. st2 - s g. 2x2 - 18 h. 2x2 - 32 i. 3x2 - 27y2 j. 18m2 - 8 3. k. 12a2 - 27b2 l. 63c2 - 7 m. x3 - 4x n. y3 - 25y o. z3 - z 4. p. 4c3
59. ## Algebra

For the given quadratic equation convert into vertex form, find the vertex, and find the value for x = 6. Show your work. y = -2x2 + 2x +2 -(1/2)y = x^2 - x - 1 (-1/2)y + 1 = x^2 - x (-1/2)y + 1 = (x - 1/2)^2 - 1/4 (-1/2)y = (x-1/2)^2 - 5/4 y = -2(x-1/2)^2
60. ## Algebra

For the given quadratic equation convert into vertex form, find the vertex, and find the value for x = 6. Show your work. y = -2x2 + 2x +2 -(1/2)y=x^2-x-1 (-1/2)y+1=x^2-x (-1/2)y+1=(x-1/2)^2-14 (-1/2)y=(x-1/2)^2-5/4 y=-2(x-1/2)^2+5/2 Is this right ?
61. ## Calculus

Use the four-step process to find the slope of the tangent line to the graph of the function at the given point and determine an equation of the tangent line. f(x) = -2x2-2x+1 (-1, -2)
62. ## algebra

this is what u do on your first problem....first u take out the greatest common factor that would go into all of them... 4n^2-20n+24...now what number will go into all of them...well 4 will...4 will go into 4,20,and 24...so. it would be like
63. ## multivariable calculus

Consider the surface given by the equation: 2x2 - 3z2 - 4x -4y - 12z + 2 = 0 (a) Write in standard form ) (b) Determine and classify the traces with planes parallel to the xy-, xz- and yz- planes. (c) Hence classify the surface.
64. ## Algebra

1. Evaluate. (8 – 3) (12 ÷ 2 • 2) – 20 Answer: I'm not sure if its -5 or 40 2. 6x – 7 = 5(x – 2) Answer: -3 3. Solve for y. 3x – 2y = 12 Answer: 3x-12/2 4. Solve. –3(x – 3) + 8(x – 3) = x – 9 Answer: 1 1/2 or 1.5 5. Find the slope of
65. ## College Math

For questions 1-2, apply the quadratic formula to find the roots of the given function, and then graph the function. 1. f(x) = x2 + 4 (6 points) g(x) = x2 - x – 12 For questions 3-4, factor the quadratic expression completely, and find the roots of the
66. ## statistics

Bill wants to write the equation that demonstrates the model for explaining quarter-life crisis. He is using optimism, locus of control, income, and years since completing college as explanatory variables. Which of the following equations is most
67. ## Math (matrices)

No one answered my matrix question. Let me rephrase: Let A, B, and 0 be 2x2 matrices. Assuming that A is invertible and 0 is all zeroes, what is the inverse of the matrix [A|0] [B|A] (that is a 4x4 matrix represented as 4 2x2 matrices) The answer is in the

2x2-5x+11=0
69. ## math

2x2 + 8x + 3 = 0
70. ## Algebra

If f(x) = - 2x2 + 2x - 3, what is f(5)?
71. ## geometry

f(x)=2x²-Bx+4 and f(3)=13, what is the value of B?
72. ## math

f:x = 2x²+x-6

2x2-3x-5
74. ## math

i need to factor 2x²-x-6
75. ## Math

factor 2x2 - x - 3
76. ## Math (PLZ HELP :))

If f(x) = - 2x2 + 2x - 3, what is f(5)?
77. ## Maths

Factorize 2x2^+8x-10=0
78. ## algebra

NEED HELP I AM LOST 2X2-5X-1 1
79. ## Maths

2X²+Y=15 3X+9Y=1, Solve for X and Y.
80. ## Math

Given that f(x) = 2x2 – 3, find f(2)
81. ## algebra

(3x2 - 4x + 6) - (-2x2 + 4) + (-5x - 3)
82. ## algebra

If f(x) = 2x and g(x) = ½ , calculate f(x) • g(x) A. x B. x2 C. 2x D. 2x2 I say B
83. ## math

help on this please? Factor completely 2x2 - 2x - 24. (2x - 6)(x + 4) (2x - 8)(x + 3) 2(x - 3)(x + 4) 2(x - 4)(x + 3)
84. ## ALGERBA

Can someone help me solve this please? [SQRT(2x2 + 6x + 4)] = x + 1
85. ## College algebra

What is the domain for X³+2X²-9X-18
86. ## Algebra

Which expression gives the solutions of –5 + 2x² = –6x?
87. ## physics

1)if y=x³+2x²+7x+8 then dy by dx will be- 2) if y= 1/x⁴ then, dy by dx will be: 3) if y = x² sin x, then dy/dx will be-
88. ## Math 209

f(x) = x3 + 2x2 – 0.4X – 1 how do you you factor this?
89. ## Algebra 2

Factor. 2x⁴ + x³ + 2x² + 4x - 24
90. ## algebra

)Find a value of s such that x – 4 is a factor of f(x) = x3 - 2x2+ sx + 4.
91. ## Calculus

Find the derivative of y=(2x²+x)²°°.
92. ## Math 209

f(x) = x3 + 2x2 – 0.4X – 1 how do you you factor this?
93. ## Math/Algebra

The equation ​ yˆ=−6.2x2+41.5x−5.6 ​ approximates the average number of cars that pass through an intersection x hours after 3:00 p.m. What is the best estimate for the average number of cars that pass through the intersection at 5:30 p.m.? a. 35
94. ## Math

Use the quadratic formula to solve each of the following quadratic equations... 1. 2x^2-5x=3 2. 3x^2-2x+1=0 Rearrange the equation in quadratic formula form. 2x^2 -5x -3 = 0 Then use the formula. Tell me what you don't understand about it if you don't know
95. ## Calculus (related rates)

Find dy/dt when y = 2x2 + 2x + 4 and dx/dt = 14 when x = 7.

p(x)+q(x) and p(x)-q(x),where p(x)=x3-2x2(square)-3 and p(x)=x4+x3+x2-7x
97. ## 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