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Question

The root(s) of the quadratic equation x28x12=0 is/are

A
4
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B
6
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C
2
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D
8
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Solution

The correct option is C 2
Given, x28x12=0
Let α,β be the roots of the equation ax2+bx+c=0
Then α=b+D2a

β=bD2a
D=b24ac is the discriminant of the equation.
Here, D=644(1)(12)=16
D=4
α=8+42×1=6
β=842×1=2

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