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(B) For the parabola $y^2 = 4ax$,the slope of the tangent at any point $(x_1, y_1)$ is given by $2y y_1 = 4a(x + x_1) \implies y = \frac{2a}{y_1}(x +

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$4x + 8y - 9a = 0$

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(B) For the parabola $y^2 = 4ax$,the slope of the tangent at any point $(x_1, y_1)$ is given by $2y y_1 = 4a(x + x_1) \implies y = \frac{2a}{y_1}(x + x_1)$.At the point $\left( \frac{a}{4}, a \right)$,the slope of the tangent $m_t = \frac{2a}{a} = 2$.The slope of the normal $m_n = -\frac{1}{m_t} = -\frac{1}{2}$.The equation of the normal at $\left( \frac{a}{4}, a \right)$ is given by $y - y_1 = m_n(x - x_1)$.$y - a = -\frac{1}{2}(x - \frac{a}{4})$.$2(y - a) = -(x - \frac{a}{4})$.$2y - 2a = -x + \frac{a}{4}$.$x + 2y = 2a + \frac{a}{4} = \frac{9a}{4}$.$4x + 8y = 9a$.$4x + 8y - 9a = 0$.

The equation of the normal at the point $\left( \frac{a}{4}, a \right)$ to the parabola $y^2 = 4ax$ is:

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