Question

A) Copy and write the expansions of:
a)(a + b)² = ......
b)(a-b ) square = .........
c)(a-b)(a-b)= .........​

Answer 1

Step-by-step explanation:

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

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

$(c) \: \: (a - b)(a - b) = a(a - b) - b(a - b) = {a}^{2} - ab - ab - {b}^{2} = {a}^{2} - 2ab - {b}^{2}$

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