The value of the polynomial 5x - 4x2 + 3, when x = - 1 is (A) - 6 (B) 6 (C) 2 (D) - 2

The correct answer is (A) – 6

Solution

p(x) = 5x – 4x2 + 3

To obtain p(– 1), let us substitute x = -1,

p(– 1) = 5(– 1) – 4(– 1)2 + 3

= 5(– 1) – 4(1) + 3

= – 5 – 4 + 3

= – 9 + 3

= – 6

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