Question

The roots of 3x^2+kx+12=0 are equal, find k.

Answer 1

k = 12

Explanation:

3(x² + kx + 2²) = 3(x² + ____x + 4) = 3(x² + 4x + 4) = 3x² + 12x + 12 ⇒ k = 12

Answer 2

Explanation:

3x^2+kx+12=0

k= -3x-12/x