Question

evaluate the expression a3+2a2-a+5 for a=-4​

Answer 1

${a}^{3} + 2 {a}^{2} - a + 5 \\ {( - 4)}^{3} + 2 { (- 4)}^{2} - ( - 4) + 5 \\ - 64 + 32 + 4 + 5 = - 23$

Answer 2

a=-4

putting value of a

p(-4)=-4×3+2×-4×2-(-4)+5

0=(-12)+(-16)+4+5

0=-12-16+9

0=-28+9

0=-19