Q : 4   (b)         Simplify \small a(a^2+a+1)+5 and find its value for

                         (iii) \small a=-1

Answers (1)

We have      \small a(a^2+a+1)+5.

or                  \small a(a^2+a+1)+5 = a^3+a^2+a+5

Put       a = (-1)

         =     = (-1)^3+(-1)^2+(-1)+5 = -1 + 1 -1 +5 = 4

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