Question

7. The roots of each of the following quadratic equations are real and equal, find k.
(1) 3y^2 + ky + 12 = 0 ​

Answer 1

Answer:

k= 12

Step-by-step explanation:

3y^2 + ky + 12 = 0

=> a = 3 , b = k and c= 12

If the roots are real and equal

b^2 - 4ac = 0

=> k^2 - 4 x 3 x 12 = 0

=> k^2 = 144

=> k= 12

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