Question

One of the roots of quadratic equation 2 x ^2+ k x -2 =0 is-2, find k​

Answer 1

Answer:

2x²+kx-2=0

product of zeros of quadratic equation=c/a

let another zeros be n

n×(-2)=-2/2

-2n=-2/2

n=-1/2

sum of zeros=-b/a

-1/2 + (-2)=-k/2

-5/2=-k/2

5/2=k/2

K=5

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