how would you graph (x-4)^2=-4(y+1)?

Question

anonymous · Answer

For me, I would like to put into online tool: https://www.desmos.com/calculator $$y = \frac{-(x-4)^2}{4} -1$$

anonymous · Answer

https://s3.amazonaws.com/grapher/exports/s5djowe3vy.png

polaris_s0i · Answer

lol, the roots and the vertex might be a better choice for school work :)

polaris_s0i · Answer

change the equation a little bit and it will be in vertex form already:
$$y = -\frac{1}{4}(x-4)^2 - 1$$

do you know how to get the vertex from this?

polaris_s0i · Answer

from the negative scale factor you know its pointing downward.
The vertex is located at (4, -1).

campbell_st · Answer

for mine its a concave down parabola with a vertex at (4, -1) focus at (4, -2) and directrix of y = 0

polaris_s0i · Answer

lol, I never hear them teach of directix and focus in school.

polaris_s0i · Answer

though they are what makes the parabola important.

campbell_st · Answer

well they do here... its year 11 work...