Question

Solve 2/5(x+10)=x
Using identities evaluate(164)² - (36)²​

Answer 1

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$\frac{2}{5} (x + 10) = x \\ \\ \frac{2x + 20}{5} = x \\ \\ 2x + 20 = 5x \\ \\ 2x - 5x = - 20 \\ \\ - 3x = - 20 \\ \\ x = \frac{20}{3}$

NEXT QUESTION :-

$identity \: used :- \\ \\ {a}^{2} - {b}^{2} = {a}^{2} - 2ab + {b}^{2}\\ \\(164 {)}^{2} - (36 {)}^{2} = {164}^{2} - (2 \times 164 \times 36) + {36}^{2} \\ \\ 26896 - 11808 + 1296 = 16384$