Simplify and verify the result for a=-1 b=2 c=-3
(a+b) (a^2-bc+b^2)
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(a+b) (a^2-bc+b^2)
=(-1+2) [(-1)^2-(2×-3)+(2)^2)]
=(1)[1-(-6)+4]
=[1+6+4]
=7+4
=11
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