Question

The vertex of this parabola is at (-1,-3). Which of the following could be its equation?

61,-3)
A. x=-2(y + 1)2-3
B. x=-2(y-1)2-3
C. x= -2(y + 3)2-1
D. x = -2(y-3)2-1

Answer 1

NONE

The vertex form of an equation of the parabola with vertex (-1,-3) is:

y = a(x + 1)² - 3

where a could be any number, also -2,

Explanation:

The vertex form of an equation of the parabola:

y = a(x - h)² + k

vertex is (-1, -3) so h = -1, k = -3

so:

y = a(x - (-1))² + (-3)

y = a(x + 1)² - 3