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# Simplify a (a^2 + a + 1) + 5 and find its value for (ii) a = 1.

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

(ii) $\small a=1$

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We have   $\small a(a^2+a+1)+5 = a^3 + a^2 + a + 5$

Put a = 1 ,

we get :           $1^3 + 1^2 + 1 + 5 = 1 + 1 + 1+ 5 = 8$

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