Question

4. One of the roots of quadratic equation 2x2 + kx - 2 = 0 is -2, find k​

Answer 1

Answer:

as 2 is one of the root so let x=2

=2^2 + k(2) -2=0

=4 + 2k -2 =0

=2+2k=0

=2k=-2

=k=-2÷2=-1

therefore k=-1