If x=3 is one of the root of the quadratic equation x square - 2kx -6=0 find k
a. k=4
b. k=2
c. k=1
d.k=6
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Step-by-step explanation:
f(x)=x^2-2kx-6=0
f(3)=3^2-2.k.3-6=0
=>9-6k-6=0
=>3-6k=0
=>6k=3
=> k=3/6
=> k=1/2
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