Question

For what value of k, is- 1 a zero of the polynomial 5x²+x+k?​

Answer 1

Step-by-step explanation:

let P(x) be the polynomial where

P(x) = 5x² + x + k

As -1 is a zero of polynomial

x = -1

P(x) = 5(-1)² + (-1) + k

0 = 5(1) -1 + k

0 = 5 - 1 + k

0 = 4 + k

k = -4

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Answer 2

Answer

we will put -1 in x.

Step-by-step explanation:

5(-1)square +(-1) +k=0

5(1) -1=-k

5-1=-k

4=-k

-4=k

Therefore with -4 as value of k -1 is zero of the given polynomial.