Question

which equatiom represents y=-x^2-10x-20 in vertex form
a.y=-(x-5)^2+15
b.y=-(x+5^2+5
c.y=-(x+5)^2+10
d.y=-(x-5)^2+5

Answer 1

y=-x^2-10x-20
y=-(x^2+10x+25)+25-20
y=-(x+5)^2+5
so u get b.
understood ?

Answer 2

yeah