Can someone show me a step by step of how a²+b² = (a+b)²-2ab ?

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asked Aug 24, 2021 54.4k views

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Can someone show me a step by step of how a²+b² = (a+b)²-2ab ?

Mathematics
middle-school

Giorgiline asked

by Giorgiline

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Answer:

Explanation:

$(a + b)^(2) = (a + b) * (a + b) = a*a + a*b + a*b + b*b = a^(2) + 2ab + b^(2) \\\\Therefore, \\\\(a + b)^(2) - 2ab = a^(2) + b^(2)$

NiB answered Aug 29, 2021

by NiB

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