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For the question "Which binomial is a factor of 9x² – 64?
3x – 8
9x – 32
3x + 32
9x + 8

I got two different answers from the choices: (x + 8)(9x - 8).

What went wrong?

Respuesta :

s1m1

Answer:

3x-8

Step-by-step explanation:

9x²-64  is the same as

(3x)² - 8²

now we have the difference of 2 squares, a²-b² =(a -b)(a +b), where a=3x, b=8

9x²-64 =  (3x-8)(3x+8)

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