Evaluate the expression given below for a= -4 (iii) 7a2+7a-20 (v) a3+2a2-a+5
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a=-4
7a2 +7a - 20
7.-4.2 + 7.-4 - 20 = - 56 - 28 - 20 =-104
a^3 + 2a2 - a +5 = - 4^3 + 2.-4. 2 +4 +5 = - 64 - 16 +9= - 71
7a2 +7a - 20
7.-4.2 + 7.-4 - 20 = - 56 - 28 - 20 =-104
a^3 + 2a2 - a +5 = - 4^3 + 2.-4. 2 +4 +5 = - 64 - 16 +9= - 71
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