Standard form

y=-3/5(x-0)^2+3 =

y = -3/5 x^2 + 3             Is this the standard form? ( I don't know)

y + 3/5 x^2 -3 = 0           Is the the Standard form you are looking for?

5y + 3x^2 - 15 = 0           Another form.......they are all equal .....