Question

The
value of k for which the quardantic equation
2 x² + kx+2=0 hae equal root.

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Answer 1

4 or -4

Step-by-step explanation:

The equation has equal roots. It means that the discriminant=0 or D=0

${b}^{2} - 4ac = 0$

So,

${k}^{2} - 4 \times 2 \times 2 = 0$

${k}^{2} = 16$

or k= 4 or k= -4