Question

I. Factorise:
1. 25(a + b)2 – 36(a - b)2​

Answer 1

Step-by-step explanation:

we know that (a+b)^2=a^2+2ab+b^2

(a-b)^2=a^2-2ab+b^2

then,25(a^2+2ab+b^2)-36(a^2-2ab+b^2)

25a^2+50ab+25b^2-36a^2+72ab-36b^2

25a^2-36a^2+50ab+72ab+25b^2-36b^2

-11a^2+122ab-11b^2

-11(a^-11ab+b^2)

therefore -11(a^-11ab+b^2) is the correct answer

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