Question

state whether k is root of given equation y2-(k-4)y-16=0

Answer 1

y2-(k-4)y-16=0
y(2-k-4)-16=0
y(k-2)=16
k-2=16/y
k=16/y+2
k=16+2y/y

Answer 2

2y-ky+4y=16
6y-ky=16
6y-16=ky
6-16/y=k