Question

solve the following attachment using the identity Formula given below!☺

☺Explanation Needed☺

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Answer 1

Answer:

1. (9x-5t) (9x+3t)

using identity

(9x)^2+(-5t+3t)9x+(-5t×3t)

81x^2+(-2t)9x+(-15t)

81x^2-18tx-15t

2. (x+1/x) (x-1/x)

using identity

x^2+(1/x+(-1/x))x+(1/x×(-1/x))

x^2+(0)x+(-1/x^2)

x^2-1/x^2

here's your answer

I hope it's help u!!!

Answer 2

$1)(9x - 5t)(9x + 3t)$

$let \: a \: be ⟹5t$

$let \: b \: be ⟹3t$

so,

$⟹( - 5t)(3t) = (9x^{2} ) + ( - 5t + (3t))(9x)</p><p>$

$⟹81x^{2} + ( - 2t)(9x) - 15t ^{2}$

$⟹ {81x}^{2} - 18xt - 15 {t}^{2}$

therefore:

$⟹{81x}^{2} - 18xt - 15 {t}^{2}$

$2)refer \: to \: the \: attachment$