Question

Find k for which (x + 7) is a factor of x2 – kx + 14​

Answer 1

Answer:

- 9

Step-by-step explanation:

Let p ( x ) = x² - kx + 14

x + 7 = 0

x = - 7

p ( - 7 ) = ( - 7 )² - k ( - 7 ) + 14 = 0

49 + 7k + 14 = 0

49 + 14 + 7k = 0

63 + 7k = 0

7k = - 63

k = - 63 / 7

k = - 9