Question

Square of (9x - 7xy) is 9x2 - 49x2 y2​

Answer 1

Step-by-step explanation:

(9x-7xy)²

we solve this by using identity (a-b)²= a²+2ab-b²

(9x-7xy)²= (9x)²+2*9x*7xy - (7xy)²

81x²+126x²y-49x²y²

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Answer 2

Answer:

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