Question

What are the coordinates of the vertex of the graph of y= x^2+6x-11?

A) (3, -2)
B) (3, 16)
C) (-3, -29)
D) (-3, -20)

Answer 1

The x-coordinate 0f the vertex( or the axis of the parabola)
x = -b/2a = -6/2 = -3
The y-coordinate of the vertex:
y(3) = (-3)^2 + 6(-3) - 11 = .......

Answer 2

@thu1935 -20?

Answer 3

try again

Answer 4

y(3) = (-3)^2 + 6(-3) - 11
= 9 - 18 - 11

Answer 5

simplify

Answer 6

nvm, -20 is right

Answer 7

good job :)

Answer 8

ok. thanks @ganeshie8!

Answer 9

u wlc !!