Question

***(y-k)=a(x-h)^2 . Find the x-intercept of parabola with vertex(-5,80) and y intercept (0,-45) in (x1,y1) ( x2,y2) form :D

Answer 1

y=a(x-h)^2+k
y=a(x+5)^2+80

-45=a(0+5)^2+80
-45-80=a*25
-125=25a
a=-125/25=-5

so we have
y=-5(x+5)^2+80

Answer 2

see? told you someone would help :)