Question

Find k if x=3 is a root of the equation of 3x²+kx+12=0​

Answer 1

Answer:

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Answer 2

Answer:

k = - 13

Step-by-step explanation:

The given equation is 3x² + Kx + 12 = 0

Given, x = 3 is a root of the equation of the equation.

Now,

sub x = 3 in the equation 3x² + Kx + 12 = 0

we get,

=> 3 (3)² + K(3) + 12 = 0

=> 3(9) + 3K + 12 = 0

=> 27 + 3K +12 =0

=> 39 + 3K = 0

=> 3K = -39

=> K = -39/3

=> K = -13

You can cross check if it is correct,

substituting the value of k in the equation we get,

3x² - 13x + 12 = 0

substituting the value of x,

=> 3 (3)² - 13(3) + 12 = 0

=> 3(9) - 39 + 12 = 0

=> 27 - 39 + 12 = 0

which is correct.

Hope this helps(　＾∇＾)