【高校数学C】4-1-1 放物線｜問題集

\(x^2=4・y\)
焦点は\((0,1)\)
準線は\(y=-1\)

\(\displaystyle x^2=4・\left(-\frac{1}{8}\right)y\)
焦点は\(\displaystyle \left(0,-\frac{1}{8}\right)\)
準線は\(\displaystyle y=\frac{1}{8}\)

\(\displaystyle y^2=4・2x\)
焦点は\((2,0)\)
準線は\(x=-2\)

\(\displaystyle y^2=4・-x\)
焦点は\((-1,0)\)
準線は\(x=1\)

\(\displaystyle y^2=4・\frac{1}{4}x\)
焦点は\(\displaystyle \left(\frac{1}{4},0\right)\)
準線は\(\displaystyle x=-\frac{1}{4}\)