Question

If x=3 is a solution of the equation 3x^2+ (k-1) x +9 =0 then k=?

Answer 1

Step-by-step explanation:

• 3x²+(k-1)x+9=0
• if X = 3
• 3(3)²+(k-1)3+9=0
• 3×9+3k-3+9=0
• 27+3k-3+9=0
• 33+3k=0
• 3k = -33
• k = -33/3
• k = -11

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