recall that for y = ax^2+bx+c the axis and vertex always lie on the line
x = -b/2a
hi guys need help with a few questions.
1. Which equation represents the axis of symmetry of the function y = 2x^2+4x-6? A. y= 1 B. x= 1 C. x=3 D x= -3
2. & 3. What are the coordinates of the vertex of the graph of the function -
2. y = -x^2+6x-11 A. (3,-2) B. (3,16) C. (-3,-29) D. (-3,-20)
3. y = -3x^2 -12x + 3 A. (-2,29) B (2,-15) C. (2, -9) D. (-2,15)
4 answers
@steve what question r u talking about
Steve's "big hint" applies to all 3 of your questions.
I will use it on #3
comparing:
y = ax^2 + bx + c , and
y = -3x^2 - 12x + 3, ---> a=-3, b=-12, c=3
the x of the vertex is -b/(2a) = -(-12)/-6 = -2
which also means that the axis of symmetry is
x = -2
to get the y of the vertex, plug it in
y = -3(-2)^2 - 12(-2) + 3
= -3(4) + 24 + 3 = 15
So the vertex is (-2,15)
Now, you do the other two.
I will use it on #3
comparing:
y = ax^2 + bx + c , and
y = -3x^2 - 12x + 3, ---> a=-3, b=-12, c=3
the x of the vertex is -b/(2a) = -(-12)/-6 = -2
which also means that the axis of symmetry is
x = -2
to get the y of the vertex, plug it in
y = -3(-2)^2 - 12(-2) + 3
= -3(4) + 24 + 3 = 15
So the vertex is (-2,15)
Now, you do the other two.
Okay I’m just gonna do what everyone wants and what I came here to find but couldn’t
Here’s the answers
1.B
2.A
3.D
4.B
5.D
6.B
I got almost nothing on my quick check so that I could see the correct answers and give them to you guys
This is what the quick check says were actually the correct answers do have fun
Here’s the answers
1.B
2.A
3.D
4.B
5.D
6.B
I got almost nothing on my quick check so that I could see the correct answers and give them to you guys
This is what the quick check says were actually the correct answers do have fun
1 answer