21m^2 + 7m = 0 m (21m + 7) = 0 m = 0 Or, 21m + 7 = 0 m = 721 Therefore, m = 13 ...

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Solve 21m2 ...

Question

Solve $21 m^{2} + 7 m = 0$

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Solution

$21 m^{2} + 7 m = 0$
$m (21 m + 7) = 0$
$m = 0$
$O r,$
$21 m + 7 = 0$
$m = \frac{- 7}{21}$
$T h e r e f o r e,$
$m = \frac{- 1}{3}$

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