So how would I go about solving this quadratic equation:
y=-1x^2 - 10x
I know the axis of symmetry is -5 because x=-b/2a. When I try to find the y axis however, I get y=25. Is that right? if not, how would I solve this question? Thanks for helping me!
No, that's incorrect! You just found the coordinates of the VERTEX, but you need the solutions/zeroes/roots, instead.
To find the solutions/zeroes/roots, you simply set the equation equal to 0, as follows: , and solve for x.
You should get: