Question

if x = -1/2 is a solution of the quadratic equation 3x2+2kx-3=0, find k

Answer 1

3(-1/2)²+2k(-1/2)-3=0
3(1/4)-k-3=0
k=3/4-3
k=(3-12)/4=9/4

Answer 2

Answer:

The other answer is wrong .

the answer is 9/4 as he forgot to put -ve sign.

3(-1/2)²+2k ×-1/2 -3 =0

3/4-k-3=0

3/4-3=k

3-12/4=k

-9/4=k