Question

plz tell this answer​

Answer 1

Answer:

(a+b)(a-b)= a² - b²

Using this identity, (8x+9y)(8x-9y)

= (8x)²-(9y²)

(8)²=64 and (9)² = 81

So (8x)²-(9y)²= 64x²-81y²

Answer 2

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✴ To solve (8x+9y) (8x-9y) using identity.

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We know that ;

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(x + y) (x - y) = x² - y²

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So, taking 8x as x and 9y as y we get ;

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➥(8x + 9y) (8x-9y) $<font color= black>$

➯ (8x)²- (9y)²

➯ 64x² - 81y²