Question

If -4 is. Zero of polynomial X2- x- (2k + 2) then k =

Answer 1

Just put -; in place of x and equate it with 0
=> 16 + 4 -(2k+2) = 0
=> 2k+2 = 20
=> 2k = 18
=> k=9

Answer 2

Answer:

k=5

Step-by-step explanation:

given equation = g(x)= x^2 -x -(2k+2)

if -4 is a root of g(x)

then, g(-4)=0

therefore

(-4)^2  - (-4) - (2k+2) = 0

16 + 4 -2k -2 =0

18 - 2k =0

2k = 18

k = 9

Hence, answer k= 9

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