Mathematics

Mathematics

Problem

a. (i) For the parabola x2=12yx^{2}=12y, state whether its axis is horizontal or vertical, and mention the direction in which it opens. b. (ii) Find the coordinates of its focus.
Intuitive explanation

The key to parabolas is recognizing their standard form: when x2x^2 is isolated (not y2y^2), the axis is vertical, and the parabola opens in the direction the variable on the right-hand side points. By comparing x2=12yx^2 = 12y to the standard form x2=4pyx^2 = 4py, you can extract the focal parameter pp, which tells you both how far the focus sits from the vertex and confirms the opening direction.

Intuitive explanation

The key to parabolas is recognizing their standard form: when x2x^2 is isolated (not y2y^2), the axis is vertical, and the parabola opens in the direction the variable on the right-hand side points. By comparing x2=12yx^2 = 12y to the standard form x2=4pyx^2 = 4py, you can extract the focal parameter pp, which tells you both how far the focus sits from the vertex and confirms the opening direction.

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