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What is 12a^-15ab-16a+20b in factored form ??

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Since there are 4 terms you will "factor b y grouping"
3a(4 - 5b) -4(4 - 5b)

each term has a common (4 - 5b) to factor out
(4 - 5b)(3a - 4)
User Nigel Tufnel
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