Parabola: standard forms
Two-dimensional geometry · Mathematics
Study notes
Q: Identify: (a) y² = 12x (b) x² = −8y. Give focus and directrix. (a) 4a = 12, a = 3. Right-opening. Focus (3,0), directrix x = −3. (b) 4a = 8, a = 2. Down-opening. Focus (0,−2), directrix y = 2.