how would i factor
which ones are
factor by grouping
2 Answers By Expert Tutors
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(3x + 6) (3x - 6)
I don't understand the second part of your question.
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a2 - b2 = (a - b)(a + b)
9x2 - 36 = 9(x2 - 4) = 9(x - 2)(x + 2)
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