Question

if x = 3 is solution of equation 3x² +(k-1 ) x+9=0 then 15 is

Answer 1

put value of 3 in the equation at place of x

3(9)+k-1(3)+9=0

27+3k-3+9=0

33=-3k

k=-11

Answer 2

27+(k-1)3+9=0

36+3k-3=0

3k= -33

k= -11