Find the equation of normal line to the curve $y=x^{3}+2 x+6$ which is parallel to the line $x+14 y+4=0$.
finding the slope of the tangent by differentiating the curve
$\frac{d y}{d x}=3 x^{2}+2$
$\mathrm{m}($ tangent $)=3 x^{2}+2$
normal is perpendicular to tangent so, $m_{1} m_{2}=-1$
$\mathrm{m}($ normal $)=\frac{-1}{3 \mathrm{x}^{2}+2}$
equation of normal is given by $y-y_{1}=m($ normal $)\left(x-x_{1}\right)$
now comparing the slope of normal with the given equation
$\mathrm{m}($ normal $)=-\frac{1}{14}$
$-\frac{1}{14}=-\frac{1}{3 x^{2}+2}$
$x=2$ or $-2$
hence the corresponding value of $y$ is 18 or $-6$
so, equations of normal are
$y-18=-\frac{1}{14}(x-2)$
Or
$y+6=-\frac{1}{14}(x+2)$
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