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Question

Which of the following is/are the roots of the quadratic equation
x2x20=0 ?

A
x=4
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B
x=4
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C
x=5
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D
x=5
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Solution

The correct option is C x=5
Given quadratic equation,
x2x20=0
Using the factorization method,
x2+4x5x20=0
(x5)(x+4)=0
x5=0 or x+4=0
x=5 or x=4

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Methods of Solving a Quadratic Equation
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