Question

(7a-6b+5c) square - (7a+6b-5c)square

Simplify

Answer 1

solution=>

$(7a - 6b + 5c) {}^{2} - (7a + 6b - 5c) {}^{2} \\ \\ = (7a + 7a - 6b + 6b + 5c - 5c)(7a - 7a - 6b - 6b + 5c + 5c) \\ \\ = (14a)( - 12b + 10c) \\ \\ = - 168ab + 140ac$

formula uses

$= > a {}^{2} - b {}^{2} =( a {}^{2} + b {}^{2} )(a {}^{2} - b {}^{2} )$

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I hope it helps you