Can someone please help me with this??
Sketch the set of three parabolas on the same number plane (in different colours)
y=x^2-2x-8
y=2x^2-4-16
y=8+2x-x^2

Question

Can someone please help me with this??
Sketch the set of three parabolas on the same number plane (in different colours)
y=x^2-2x-8
y=2x^2-4-16
y=8+2x-x^2

n00bstyle · Answer

in maths, you have certain numbers that really helps you see out seeing what a formula does:
0
-1
1
infinity
-infinity

Just fill them in, and you will see really quick what a formula means or does

sshayer · Answer

$$y=x^2-2x-8=(x^2-2x+1-1)-8=(x-1)^2-9$$
(x-1)^2=y+9
it is an upward parabola
vertex is (1,-9)

sshayer · Answer

similarly for others complete the square and find vertex.

directrix · Answer

@SugarMochi 

If you are allowed to use graphing programs, go to desmos.com  .

Enter the three equations. The program will draw the three parabolas.

On the second equation you entered, I think an "x" is missing.

>>>y=2x^2-4-16