Which of the following is/are the roots of the quadratic equation x2−x−20=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 Cx=5 Given quadratic equation, x2−x−20=0
Using the factorization method, ⇒x2+4x−5x−20=0 ⇒(x−5)(x+4)=0 ⇒x−5=0 or x+4=0 ⇒x=5 or x=−4