Unit Test — Unit test

Question 1

Which equation is the inverse of y = x2 – 36?

Revolt · Accepted Answer

y = plus-or-minus StartRoot x + 36 EndRoot

Question 2

Louis used a quadratic equation to model the height, y, of a falling object x seconds after it is dropped. Which ordered pair generated by this model should be discarded because the values are unreasonable?

Revolt · Accepted Answer

(–4, 1)

Question 3

If the discriminant of a quadratic equation is 4, which statement describes the roots?

Revolt · Accepted Answer

There are two real roots.

Question 4

Using the quadratic formula to solve 11x2 – 4x = 1, what are the values of x?

Revolt · Accepted Answer

StartFraction 2 Over 11 EndFraction plus-or-minus StartFraction StartRoot 15 EndRoot Over 11 EndFraction

Question 5

Use the zero product property to find the solutions to the equation x2 – x – 6 = 0.

Revolt · Accepted Answer

x = –2 or x = 3

Question 6

Which expression is equivalent to (4 + 6i)2?

Revolt · Accepted Answer

–20 + 48i

Question 7

Use the zero product property to find the solutions to the equation 2x2 + x – 1 = 2.

Revolt · Accepted Answer

x = or x = 1

Question 8

Which could be the function graphed below?

Revolt · Accepted Answer

f (x ) = StartRoot x + 4 EndRoot

Question 9

Which equation is the inverse of y = 7x2 – 10?

Revolt · Accepted Answer

y = plus-or-minus StartRoot StartFraction x + 10 Over 7 EndFraction EndRoot

Question 10

Which equation is an example of the commutative property of multiplication?

Revolt · Accepted Answer

(4 + 2i)(3 – 5i) = (3 – 5i)(4 + 2i)

Unit Test — Unit test Answers

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