Question

t
$t ^{2} - 15$
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Answer 1

${t}^{2} - 15 = {(t)}^{2} - {( \sqrt{15}) }^{2} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = (t + \sqrt{15} )(t - \sqrt{15} )$

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