Question

solve the following
$a { }^{2} - 4$
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Answer 1

Answer:

${a}^{2} - 4 \\ = {a}^{2} - {2}^{2} \\ = (a + 2) \times (a - 2) \\ \\ identity \: \: used \: \\ \\ {a}^{2} - {b}^{2} \\ = (a + b)(a - b)$