Question

10. factorise using suitable identities 4(x +y)^2 - 28(x²-y^2) +49(x - y)^2​

Answer 1

Answer:

2x^2+73y^2-90xy.is it's crct ans

Answer 2

Step-by-step explanation:

Let (x+y) = a

And (x-y) = b

Then, 4a²-28ab +49b²

Now, by using identity - (a-b) ².

So,

(2a)² - 2×2a×7b+(7b)² = (2a-7b)²

Now, substitute the value of a and,

(2a-7b)² = {2(x+y) - 7(x-y)}²

= {2x+2y-7x+7y}²

= {-5x+9y}²

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