Question

If-2 is the root of the equation 3x2+4x+2k=0 find the value of k

Answer 1

6+4×–2+2k=0

6+(–8)+2k=0

6–8+2k=0

–2+2k=0

2k=2

K=1

Answer 2

3x² +4x+2k=0

3(-2)² + 4(-2) + 2k=0

3(4) + (-8) + 2k=0

12 - 8 + 2k=0

4 + 2k=0

2k=-4

k=-2

here the quadratic equation has root -2

so put -2 as a value of x