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Question
The quadratic equation whose roots are 1:
Options
2x2 + x – 1 = 0
2x2 – x – 1 = 0
2x2 + x + 1 = 0
2x2 – x + 1 = 0
MCQ
Solution
2x2 – x – 1 = 0
Explanation:
Required quadratic equation is
`"x"^2 - (1 - 1/2)"x" + (1 xx (-1)/2) = 0`
⇒ `"x"^2 - (1/2 "x") - 1/2 = 0`
∴ 2x2 – x – 1 = 0
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