Question

find the value of k if x-3 is a factor of p(x) = x-kx-21​

Answer 1

Answer:

x-3= x-kx-21

x-3= x(1-k) -21

x-x(1-k)=21+3

1-k=24

k=25

Step-by-step explanation:

x-3= x-kx-21

x-3= x(1-k) -21

x-x(1-k)=21+3

1-k=24

k=25

Answer 2

Answer:

heyy dude

your answer is k= -6

proof:

Step-by-step explanation:

x-3=0

x=3

then :

p(x) = x-kx-21

put value

p(3) = 3-3k-21

3-3k-21=0

3-21=3k

-18=3k

k= -6

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