Question

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Answer 1

$1)4ab {}^{3} - a {}^{3} b = ab(4b {}^{2} - a {}^{2} ) = ab((2b) {}^{2} - a {}^{2} ) = \ = ab(2b - a)(2b + a) \ 2) - 9b - 6b {}^{2} - b {}^{3} = - b(9 + 6b + b {}^{2} ) = - b(3 + b) {}^{2} \ 3)3a {}^{2} + 3ab - 7a - 7b = 3a(a + b) - 7(a + b) = \ = (a + b)(3a - 7)$