Question

Find k if, y = −1 is one of the root of quadratic equation ky − y − 4 = 0

a. −3 b. −4 c. +3 d. +4​

Answer 1

Answer:

K=+3

Step-by-step explanation:

if y=-1

K(-1)-(-1)-4=0

-K+1-4=0

-K-3=0

K×-1=3

K=3/1

K=3

Answer 2

Answer:

substitute y=-1 in equation

so now,

k*(-1)-(-1)-4=0

-k+1-4=0

k=-3