Question

using the identity (a-b)^2 = a^2 - 2ab + b^2 find (5a-7b)^2​

Answer 1

Answer:

$Since, \: {(a - b)}^{2} = {a}^{2} + {b}^{2} - 2ab \\ = > {(5a - 7b)}^{2} \\ = {(5a)}^{2} + {(7b)}^{2} - 2 \times 5a \times 7b \\ = 25 {a}^{2} + 49 {b}^{2} - 70ab$

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Answer 2

Step-by-step explanation:

(5a-7b)^2

(5a)^2 +(7b)^2- 2 (5a)(7b)

25a^2 +49b^2 - 70ab

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