Question

(5a-7b) ^2+2(5a-7b)(9b-4a) +(9b-4a) ^2

Answer 1

Hope it helps you.....

Answer 2

HERE IS YOUR ANSWER..⬇⬇

We know that,

$(a + b) {}^{2} = a {}^{2} + 2ab + b {}^{2}$


By using this formula ,

We get,

$(5a - 7b) {}^{2} + 2(5a - 7b)(9 b- 4a) + (9 b- 4a) {}^{2} \\ \\ =[ (5a - 7b) + (9 b- 4a)] {}^{2} \\ \\ = (5a - 7b+ 9 b- 4a) {}^{2} \\ \\ = (a +2b) {}^{2} \\ \\ = a{}^{2}+2×a×2b +(2b){}^{2} \\ \\ = a{}^{2}+4ab+4b{}^{2}$

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