Question

Find the value of k which x=-3 is a root of the equation x²+ kx- 21 =0 and find the other root.​

Answer 1

Answer:

k=4

Step-by-step explanation:

x²+kx-21

-3²-3k-21

9-21-3k=0

12-3k=0

-3k= -12

k= -12/-3

k=4