Math, asked by lavania1712, 5 months ago

(7x-9y)(7x-9y) by suitable identity

Answers

Answered by anathakur27

1

Answer:

49x2+81y2--126........….....

Answered by itachi1464

3

Answer:

49x²+81y²-126xy

Step-by-step explanation:

(7x-9y)²

(a-b)²=a²+b²-2ab

(7x)²+(9y)²-2.7x.9y

49x²+81y²-126xy

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