Question

if 3x-21 is a factor of 2x²+k then find the value of k​

Answer 1

Answer:

Answer is here

Step-by-step explanation:

3x-21=0

So x=21/3=7

Answer 2

3x - 21 = 0, it is a factor..

=> x = 7

Therefore,

$p(x) = 2 {x}^{2} + k \\ \\ p(7) \: = 2 {(7)}^{2} + k \\ \\ = > 0 = 98 + k \\ \\ = > k = - 98$

Hope you got it