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Which of the following equations is/are not quadratic ?
$q_1: (x-1)^2 = x^2$,
$q_2: (x-1)^3 = x^3$
$q_3: (x+1)^3 = 3x^2$,
$q_4: (\sqrt{x}+1)^2 = 2\sqrt{x}$
$q_1: (x-1)^2 = x^2$,
$q_2: (x-1)^3 = x^3$
$q_3: (x+1)^3 = 3x^2$,
$q_4: (\sqrt{x}+1)^2 = 2\sqrt{x}$
- (a)$q_1, q_3$ and $q_4$
- (b)$q_2$ and $q_3$
- (c)$q_2, q_3$ and $q_4$
- (d)$q_1$ and $q_4$
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Ans. (a) $q_1, q_3$ and $q_4$