if the equation of a parabola is y=7(x-4)^2+v, then what is the value of v?

Question

anonymous · Answer

could be anything.

anonymous · Answer

if the vertex is (4, -2)
forgot to add that part

anonymous · Answer

okay, substitute y = -2 and x = 4 in the equation and find v

anonymous · Answer

I'm kind of confused

anonymous · Answer

what are you confused about? have you ever done substitution?

anonymous · Answer

I haven't ever had anyone explain it to me in detail. I'm home schooled and my mom doesn't have any knowledge of this stuff

anonymous · Answer

okay the equation of the parabola is given. the vertex is given.
the vertex is a point on the parabola right? so we can substitute the vertex instead of x and y in the equation
so
y = 7(x-4)^2+v

becomes

-2 = 7(4-4)^2+v
4-4 =0, so 
-2 = 7*0^2 +v
-2 = v
or v = -2