how do i do this really don't understand it?

Question

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689

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f2 – 79 = -15 How do i factor this

Guest Mar 30, 2017

hectictar · Answer 1 · 2017-03-30T09:37:16

f² - 79 = -15

Add 15 to both sides.

f² - 64 = 0

This is now a "perfect square binomial," and you can write it like this:

(f - 8)(f + 8) = 0 :)