Question

If 3 is a solution of 3x² + (k-1)x +9=0 then k=
A) 11
B)-11
C) 13
D) -13​

Answer 1

Answer:

b...................

Answer 2

Step-by-step explanation:

We have

3x^2 + (k-1)x +9 =0

if 3 is solution of this given question then it must be x=3

so

3×3^2 +(k-1)×3 +9 =0

3×9 +(k-1) ×3+9=0

27+3k-3+9=0

33+3k=0

3k= -33

k = -33/3

K = -11