The vertex form of the equation of a parabola is y = 4(x - 2)2 - 1. what is the standard form of the equation?
a. y = 4x2 - 16x + 2
b. y = 4x2 - 16x + 15
c. y = 4x2 - 3
d. y = 16x2 - 5 ?

Ok so your original equation was y=4(x-2)²-1
Therefore we need to expand the bracket to find the original equation.
To do this we need to find (x-2)²=x²-4x+4
Now we multiply this by 4 and subtract 1
4x²-16x+15 Therefore B is the answer