Question

if X equal minus 1 by 2 is a solution to the quadratic equation 3 X square + 2 K X equal 30 find k​

Answer 1

x=-1/2

3x²+2kx=30

3(-1/2)²+2(-1/2)k=30

3/4-k=30

-k=30-3/4

-k=120-3/4

-k=117/4

k=-117/4