Question

Find the value of (-5m+
$6n) {}^{2}$
by using identies ​

Answer 1

Answer:

$( - 5m + 6n {)}^{2} \\ we \: \: will \: \: use \: \: this \: \: identity \\ (x + y {)}^{2} = {x}^{2} + {y}^{2} + 2xy \\ ( - 5m + 6n {)}^{2} = ( - 5m {)}^{2} + (6n {)}^{2} + 2 \times ( - 5m) \times (6n) \\ = 25 {m}^{2} + 36 {n}^{2} - 60mn \\ answer$

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