Expand (x+3y)² and (2a-3b)² using identities.
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(x + 3y)² [Identity: (a + b)² = a² + b² + 2ab]
= (x)² + (3y)² + 2(x)(3y)
= x² + 9y² + 6xy
(2a-3b)² [Identity: (a - b)² = a² + b² - 2ab]
= (2a)² + (3b)² - 2(2a)(3b)
= 4a² + 9b² - 12ab
I hope it helps you
Happy Learning :D
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