ACT Question

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ACT Question for July 22nd

For the function h(x) = 4x² - 5x, what is the value of h(-3)?

A) -93

B) -9

C) 21

D) 51

E) 159

Correct

Incorrect

The correct answer is (D).

Getting to the Answer: The question asks for the value of h(-3), given the function h(x)=4x²-5x. Substitute -3 for x to get 4(-3)²-5(-3). This simplifies to 4(9) + 15 = 36 + 15 = 51.

(A) Incorrect: this does not match the calculations above

(B) Incorrect: this is the result of using -5x² instead of -5x

(C) Incorrect: this is h(3), not h(-3)

(D) Correct: this matches the correct calculation

(E) Incorrect: this is (4(-3))²-5(-3), not 4(-3)²-5(-3)