Question

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

Answer 1

could be anything.

Answer 2

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

Answer 3

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

Answer 4

I'm kind of confused

Answer 5

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

Answer 6

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

Answer 7

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