4ab 2a 2b 2a
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a^2-b^2 a-b a+b a+b is this correct?
4ab 2a 2b 2a
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a^2-b^2 a-b a+b a+b is this correct?
4aba2−b2−2aa−b−2ba+b|a2−b2=(a−b)(a+b)=4ab(a−b)(a+b)−2aa−b−2ba+b=4ab(a−b)(a+b)−2aa−b⋅(a+ba+b)−2ba+b⋅(a−ba−b)=4ab−2a(a+b)−2b(a−b)(a−b)(a+b)|(a−b)(a+b)=a2−b2=4ab−2a(a+b)−2b(a−b)a2−b2=4ab−2a2−2ab−2ab+2b2a2−b2=4ab−4ab−2a2+2b2a2−b2=−2a2+2b2a2−b2=−2⋅(a2−b2)a2−b2=−2