the general form is x^2 = 4ay where a = the y coordinate of the focus can you work it out ?
what do i work out sorry i have no idea what to do with these types of questions
the focus is at (0,-4) - that is the y coordinate is - 4
x^2 = 4(-4)y
this type of parabola as the origin at (0,0) because x = 0 when y = 0 and as the focus is negative 4 opens downwards
no x^2 = -16y divide both sides by -16 f(x) = y = - 1 x^2 ---- 16
C is the correct choice
so A ?
A is sixteen C is negative sixteenth
so what would be the equation to solve it ?
the equation of the curve is f(x) = - one sixteenth x^2
yea but to solve Derive the equation of the parabola with a focus at (−5, −5) and a directrix of y = 7.
oh thats a new question