For the question “Which binomial is a factor of 9x² – 64? 3x – 8 9x – 32 3x + 32 9x + 8 I got two differ

Question

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?

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Bình An 3 years 2021-08-10T08:55:10+00:00 1 Answers 7 views 0

Answers ( )

  1. phucdien
    0
    2021-08-10T08:56:41+00:00
    Reply

    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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