y = -3(x + 5)^2 - 4

Convert the equation from vertex form to standard form.

A. y = 9x^2 - 15x + 21

B. y = 3x^2 - 30x - 79

C. y = 3x^2 - 75x - 4

D. y = 9x^2 + 90x + 221​