Question

$verify \: the \: identity \: {( \: a \: - \: b )}^{2} \: = \: {a}^{2} \: + \: {b}^{2} \: - \: 2ab \: for \: a \: = \: 1 \: and \: b \: = = \: - \: 2$
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Answer 1

Answer:

See the attachment for answer.

Answer 2

Answer:

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