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Question
(a) `3x-x^2=x^2+5` (b) `(x+2)^2=2(x^2-5)`
(c) `(sqrt2x+3)^2=2x^2+6` (d)` (x-1)^2=3x^2+x-2`
Solution
(c) `(sqrt2x+3)^2=2x^2+6`
∵` (sqrt2x+3)^2=2x^2+6`
⇒ `2x^2+9+6sqrt2x=2x^2+6`
⇒` 6sqrt2x+3=0` which is not a quadratic equation
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