For which value(s) of does the quadratic equation have equal real roots?

MATHEMATICS · Single correct · CBSE · Mathematics · Quadratic Equations · Quadratic Equations

Problem

For which value(s) of

k

does the quadratic equation

2x^2+kx+8=0

have equal real roots? (a)

8

only (b)

\pm 4\sqrt{2}

(c)

8 \text{ or } -8

(d)

\pm 4