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Which of the following equations is/are quadratic equation(s) ?
$q_1: (y+1)^2 = 2y$,
$q_2: (y-1)^2 = y^2$
$q_3 : (y+1)^3 = (y-1)^3$, $q_4:1+\sqrt{y} = (\sqrt{y} +1)^2$
$q_1: (y+1)^2 = 2y$,
$q_2: (y-1)^2 = y^2$
$q_3 : (y+1)^3 = (y-1)^3$, $q_4:1+\sqrt{y} = (\sqrt{y} +1)^2$
- (a)$q_1, q_2$ and $q_4$
- (b)$q_1$ and $q_2$
- (c)$q_1, q_3$ and $q_4$
- (d)$q_1$ and $q_3$
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Ans. (d) $q_1$ and $q_3$