Question

which of the following is not a quadratic equation?

1. 3x-x^2 = x^2+5
2. (x+2) ^2 = 2(x^2-5)
3. (√2x+3) ^2 = 2x^2+6
4. (x-1) ^2 = 3x^2+x-2
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Answer 1

Answer:

The first one is not a quadratic equation