Since our x coefficient of -12 is negative The parabola opens left
horizontal parabola equation
y2 = 4cx
4c = -12
Divide each side by 4:
4c
4
=
-12
4
c = -3
Our focus is (-3,0)
You have 2 free calculationss remaining
Determine directrix equation:
Directrix is in the form x = c, so we have x = -3
What is the Answer?
Our focus is (-3,0)
How does the Parabolas Calculator work?
Free Parabolas Calculator - Determines the focus, directrix, and other related items for a parabola. This calculator has 1 input.
What 5 formulas are used for the Parabolas Calculator?
standard horizontal parabola equation is y2 = 4cx standard vertical parabola equation is x2 = 4cy If the x coefficient is negative, then parabola opens left If the x coefficient is positive, then parabola opens right