Question

factorise t2-2t-15 .

Answer 1

this is answer of your question I hope you can understand.

Answer 2

$\sf \purple{ Question :{t}^{2} - 2t - 15} \\ \sf = {t}^{2} -5t + 3t - 15 \\ \sf = t(t - 5) \: + 3(t - 5) \\ \sf\pink { = (t + 3) \: (t - 5)\: Answer} \\ </p><p>$