The value(s) of k for which the quadratic equation 2x^2 + kx + 2 = 0 has equal roots, is... | MCQ 1m | Maths | SuperPadhai

Quadratic Equations > Question

MCQ1 markYear: 2020EasyCBSE Class 10

quadratic-equationsdiscriminantequal-roots

Question

The value(s) of

k

for which the quadratic equation

2 x^{2} + k x + 2 = 0

has equal roots, is

Solution

1

For equal roots, discriminant

= 0

:

k^{2} - 4 (2) (2) = 0 \Rightarrow k^{2} = 16 \Rightarrow k = \pm 4

+1 mark

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