The vertex form of the equation of a parabola is y = 2(x + 4)2 - 7. What is the standard form of the equation?

To obtain the standard form of the equation of the parabola y=2(x+4)^2-7, first perform the indicated operations:
y = 2[x^2 + 8x + 16 - 7], or
y = 2[x^2 + 8x + 9],
or y = 2x^2 + 16x + 18
None of the given possible answers match. The fourth one, D, is closest to the above result, differing only in the constant term (25 versus 18).

Element 17 is chlorine it is a group 7 element(halogen) and belongs to period 3 of the periodic table