Question

Find the vertex of the following function.
f(x) = -2x2 - 4x
find the order pairs?

Answer 1

oh this is easy:
set y = o and solve for x, you will get two solutions for x
then substitute one solution to the original equation and solve for y
do that again with the other x value and you have two coordinates

Answer 2

f(x) = -2x^2 -4x

set f(x) = 0

0 = -2x^2 - 4x
0 = -2x( x + 2)
-2x = 0 or x + 2 = 0
x = 0 or x = -2

Substitute the first solution into the original equation
f(x) = -2x^2 - 4x
f(0) = -2(0)^2 -4(0)
f(0) = 0 * you got a y value for your first coordinate

Substitute the second solution into the original equation
f(x) = -2x^2 - 4x
f(-2) = -2(-2)^2 - 4(-2)
f(-2) = -2(4) + 8
f(-2) = -8 + 8
f(-2) = 0

Answer 3

good job dada

Answer 4

thanks

oh i forgot to tell you the coordinates are : (0,0) and (-2,0)