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Question
Which of the following is not a quadratic equation?
Options
3x – x2 = x2 + 5
(x + 2)2 = 2(x2 – 5)
`(sqrt(2)x + 3)^2 = 2x^2 + 6`
(x – 1)2 = 3x2 + x – 2
MCQ
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Solution
`bb((sqrt(2)x + 3)^2 = 2x^2 + 6)`
Explanation:
∵ `(sqrt(2)x + 3)^2 = 2x^2 + 6`
⇒ `2x^2 + 9 + 6sqrt(2)x = 2x^2 + 6`
⇒ `6sqrt(2)x + 3 = 0`, which is not a quadratic equation
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