simplify :- a(a^2+a+1) +5 and find it's value fir a) a=0 b) a=1 c) a=-1
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If a=0,then
a(a square+a+1)+5
=0(0+0+1)+5
=0+5
=5
If a=-1,then
a(a square+a+1)+5
=-1(-1+1+1)+5
=1+1+1+5
=8
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