Question

The Equation of the directrix to parabola $y^2=8x$ is _____

• A. $x+2=0$
• B. $x+3=0$
• C. $x+1=0$
• D. $x=0$

Answer 1

The correct option is A

$x+2=0$

In the previous sections, we have already studied how to find the equation of directrix

The Equation of the directrix to parabola $y^2=4ax$ is$x+a=0$

For Parabola $y^2=8x$

$a=2$

Equation of the directrix is $x+2=0$

Option A is correct.