Unit Test — Unit test Answers
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The sum of a number and its square is 42. Which equation can be used to find the two numbers for which this is true?
A
x2 + x = 42B
x2 + 2x = 42C
x2 + x + 42 = 0D
x2 + 2x + 42 = 022
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Solve x2 – 8x = 3 by completing the square. Which is the solution set of the equation?
A
(4 minus StartRoot 19 EndRoot comma 4 + StartRoot 19 EndRoot)
B
(4 minus StartRoot 11 EndRoot comma 4 + StartRoot 11 EndRoot)
C
(4 minus StartRoot 8 EndRoot comma 4 + StartRoot 8 EndRoot)
D
(4 minus StartRoot 3 EndRoot comma 4 + StartRoot 3 EndRoot)
23
What is the solution to 2x2+8x=x2-16?
A
x=-4B
x=-2C
x=2D
x=424
Ramiya is using the quadratic formula to solve a quadratic equation. Her equation is x = after substituting the values of a, b, and c into the formula. Which is Ramiya’s quadratic equation?Quadratic formula: x =
A
0 = x2 + 3x + 2B
0 = x2 – 3x + 2C
0 = 2x2 + 3x + 1D
0 = 2x2 – 3x + 125
A function g(x) has x-intercepts at (, 0) and (6, 0). Which could be g(x)?
A
g(x) = 2(x + 1)(x + 6)B
g(x) = (x – 6)(2x – 1)C
g(x) = 2(x – 2)(x – 6)D
g(x) = (x + 6)(x + 2)26
What are the values of a, b, and c in the quadratic equation 0 = 5x – 4x2 – 2?
A
a = 5, b = 4, c = 2B
a = 5, b = –4, c = –2C
a = –4, b = 5, c = –2D
a = 4, b = –5, c = –2Did you find these answers helpful?
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