Question

If 3 is a solution of 3x^2 + (k - 1) x + 9 = 0,
then k = ?
(A) -9
(B) -11
(C) -13
D) -16​

Answer 1

Answer:

ANSWER IS (B) -11

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Step-by-step explanation:

if 3 is a solution then put x=3

》3x^2 + (k - 1) x + 9 = 0,

》3(3)^2+(k-1)×3+9= 0

》3×9+3k-3+9= 0

》27+3k+6= 0

》33+3k= 0

》k=-11