Question

5. If x=-1 is a zero if polynomial x' + 8x+k, find k.​

Answer 1

Answer:

9

Step-by-step explanation:

x + 8x + k = 0

(x = -1)

-1 + 8(-1) + k = 0

-1 + (-8) + k = 0

-1 - 8 + k = 0

-9 + k = 0

k = 9

Answer 2

Here is your answer...hope it helps!

5) p(X) = x + 8x + k

given that X=-1 is the zero of the above polynomial,

substituting in place of X

p(-1) = (-1) + 8(-1) + k = 0

=> -1 - 8 + k=0

=> k = 9