Question

How to solve the 9th sum of this identities worksheet
Please fast

Answer 1

Look at it carefully, it is in the form of (a+b) ^2
So simply, use the formula and expand it...
Hope it helps!!!

Answer 2

(4a +9)^2
so , the formula is a^2 +2ab+b^2
now, 4a^2+2×4a×9b +9b^2
》》》》 16a^2+72ab+81b^2


this is ur answer

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