1 m² + m -20 pls help me out – InterviewSolution

1.

1 m² + m -20 pls help me out

Answer»

$m {}^{2} + m - 20 = 0 \\ = m {}^{2} + 5m - 4m - 20 = 0 \\ = m(m + 5) - 4(m + 5) = 0 \\ = (m + 5)(m - 4) = 0 \\ = m = - 5 \: \: and \: \: 4$

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