Question

if 3 is solution of 3x²+(k-1)x+9=0, then find k.

Answer 1

Hii mate ☺

K= -11

See the attachment☺

Hope it helps you ☺✌✌

Answer 2

Answer:

k = -11

Step-by-step explanation:

Equation: 3x² + ( k - 1 ) x + 9 = 0

Substituting the value of x = 3 we get,

⇒ 3 ( 3 )² + ( k - 1 ) ( 3 ) + 9 = 0

⇒ 3 ( 9 ) + ( 3k - 3 ) + 9 = 0

⇒ 27 + 3k - 3 + 9 = 0

⇒ 27 + 6 + 3k = 0

⇒ 33 + 3k = 0

⇒ 3k = -33

⇒ k = -33 / 3 = -11.

This is the required value of k.

Thanks !!