Algebraeasy · Past Paper
Which of the following is NOT a quadratic equation?
Ax^2 + 3 = 0
Bx + 1/x = 2
Cx^2 + sqrt(x) + 1 = 0
D3x^2 - 5x = 0
✓ Correct Answer: C — x^2 + sqrt(x) + 1 = 0
A quadratic equation must be a polynomial of degree 2; sqrt(x) makes it non-polynomial.
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