Asked by loca

-a^3+10a^2-31a+30=0
Answered by Damon
always try a = 1, no
a = -1 gives -1+10+31+30 no
a = 2 gives -8+40-62+30 YES!
so we know a = 2 is a solution
so now factor. You know one factor is (a-2) so divide.
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