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

The value of the polynomial 5x – 4x2 + 3 when x = – 1 is 

(A) –6

(B)  6

(C) 2

(D) –2

Answers (1)

[A]

Solution: Here the given polynomial is p(x) = 5x – 4x2 + 3

Then putting x = – 1 in the above equation we get

p(-1)   = 5(–1) – 4(–1)2 + 3

= – 5 – 4(–1)2 + 3

= – 5 – 4 + 3   

= – 9 + 3

= – 6

Hence the answer is -6

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