Question

expand (m+2n)²
please answer quickly if you know and also explain me a little so that I'll also be able to do it​

Answer 1

We know that (a + b)² = a² + b² + 2ab

So, here (m + 2n)² = (m)² + (2n)² + 2(m)(2n) = m² + 4n² + 4mn

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