Find the value of the polynomial 5x−4x2+3 at (i) x=0 (ii) x=−1 (iii) x=2
Let, p(x)=5x−4x2+3
(i) At x=0,
p(0)=5(0)−4(0)2+3
=3
∴p(0)=3
(ii) At x=−1,
p(−1)=5(−1)−4(−1)2+3
=−5−4+3
∴p(−1)=−6
(iii) At x=2,
p(2)=5(2)−4(2)2+3
=10−16+3
∴p(2)=−3