Question

solve
$5m {}^{2} - 22m - 15 = 0$
by factorisation
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Answer 1

$\sf 5m^2 - 22m - 15 = 0 \\\\\sf 5m^2 - 25m + 3m-15 =0 \\\\\sf 5m(m-5)+3(m-5) =0 \\\\\sf Clearly, ~m=5 ~or ~5m+3=0 => m= \frac{-3}{5}$