Question

2ab - a2- b2 from b2 + a2 - 2abc​

Answer 1

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$(b²+a²-2ab)-(2ab-a²-b²)$

$\mathbb\blue{\underline{\underline{Answer:}}}$

$2 {b}^{2} + 2 {a}^{2} + 4ab$

Answer 2

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$( {b}^{2} + {a }^{2} - 2abc) - (2ab - {a}^{2} - {b}^{2} ) \\ = 2 {b}^{2} + 2 {a}^{2} + 2ab - 2abc$