$m=-1$ or $m=-10$
Work Step by Step
$3m^2+33m+30=0$ $3m^2+30m+3m+30=0$ $3m(m+10)+3(m+10)=0$ $(3m+3)(m+10)=0$ $3(m+1)(m+10)=0$ $m+1=0$ or $m+10=0$ $m=-1$ or $m=-10$
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