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Which of the equations among the following is/are quadratic equation(s) ?
$q_1 : x^2 + x = (x+1)^2$, $q_2 : x-1= x^2 -1$, $q_3 : x^4 = x^2$, $q_4 : \sqrt{x} = x^2\sqrt{x} +1$
$q_1 : x^2 + x = (x+1)^2$, $q_2 : x-1= x^2 -1$, $q_3 : x^4 = x^2$, $q_4 : \sqrt{x} = x^2\sqrt{x} +1$
- (a)$q_1$ only
- (b)$q_1,q_2$ and $q_3$ only
- (c)$q_2$ only
- (d)$q_2$ and $q_4$ only
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(c) $q_2$ only