Question

value of 5a2-b2-4ab+7a-7b

Answer 1

Answer :

$Now, \: 5 {a}^{2} - {b}^{2} - 4ab + 7a - 7b \\ \\ = ( {a}^{2} - {b}^{2} ) + (4 {a}^{2} - 4ab) + (7a - 7b) \\ \\ = (a + b)(a - b) + 4a(a - b) + 7(a - b) \\ \\ = (a - b)( a + b + 4a + 7) \\ \\ = (a - b)(5a + b + 7)$

which is the required factorization.

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Answer 2

(a−b)(5a+b+7) is the answer.