Question

Select the correct answer. Which number is a zero of h(x) = (x2 − 81)(x + 4)

Answer 1

Answer:

C) 9

Step-by-step explanation:

I had this question on a recent test and I got it right

I hope this helps! :)

Answer 2

Answer:

9 is a zero of h(x). C. Correct

Step-by-step explanation:

We want to find the zeros of the function

$h(x) = (x^2 - 81)(x + 4)$

The zeros are the values of x that make h(x)=0, thus we need to solve the equation:

$(x^2- 81)(x + 4)=0$

Factoring:

$(x^2 - 81)=(x-9)(x+9)$

$(x-9)(x+9)(x + 4)=0$

This equation has 3 solutions:

x=9, x=-9, x=-4

A. 0 is not a zero of h(x). Incorrect

B. 4 is not a zero of h(x). Incorrect

C. 9 is one of the zeros of h(x) calculated above. Correct

D. 81 is not a zero of h(x). Incorrect