Question

(1) Solve :
$solve \: xx2 - 8x + 15 = 0$
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Answer 1

${x}^{2} - 8x + 15 = 0 \\ \\ = > {x}^{2} - 5x - 3x + 15 = 0 \\ \\ = > x(x - 5) - 3(x - 5) = 0 \\ \\ = > (x - 5)(x - 3) = 0 \\ \\ = > x = 5 \: and \: 3$