## Algebra and Trigonometry 10th Edition

Focus: $(\frac{3}{4},0)$ (Red point) Directrix: $x=-\frac{3}{4}$ (Black line)
Parabola in the standard form with the vertex at origin (horizontal axis): $y^2=4px$ $y^2=3x$ That is: $4px=3x$ $p=\frac{3}{4}$ $(p,0)=(\frac{3}{4},0)$ Directrix: $x=-p=-\frac{3}{4}$