Find the value of m for which (x+2) is a factor of -x^3+2x+3m
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(x+2) is factor of given equation
therefore, f(-2)=0;
substituting values,
(-1)³+2(-1)+3m=0;
-1-2+3m=0
-3+3m=0
therefore m=1
therefore, f(-2)=0;
substituting values,
(-1)³+2(-1)+3m=0;
-1-2+3m=0
-3+3m=0
therefore m=1
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