Question

Expand the following: (2a-3b)²

Answer 1

Since (a-b)^2

= a^2 + b^2 - 2 ab

= (2a)^2 + (3b)^2 - 2(2a)(3b)

= 4a^2 + 9b^2 - 12ab

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Answer 2

answer-

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

= (2a)^2+(3b)^2-2×2a×3b

=4a^2+ 9b^2-12ab

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