SOLUTION: f(x)=-12x^2+84x
Find the vertex
Algebra.Com
Question 486903: f(x)=-12x^2+84x
Find the vertex
Found 2 solutions by lwsshak3, solver91311:
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
f(x)=-12x^2+84x
Find the vertex
**
To find the vertex, you must see the equation in standard form: y=A(x-h)^2+k, with (h,k) being the (x,y) coordinates of the vertex.
..
y=-12x^2+84
This equation of a parabola is in standard form with h=0, k=84 and A=-12
The negative sign of the lead coefficient means the parabola opens downwards and has a maximum=84.
Coordinates of the vertex are (0, 84)
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
There is another way to do this.
When your parabola is in \ =\ ax^2\ +\ bx\ +\ c)
form, find the 
coordinate of the vertex with 
. Then find the 
coordinate of the vertex by \ =\ a\left(\frac{-b}{2a}\right)^2\ +\ b\left(\frac{-b}{2a}\right)\ +\ c)
John
My calculator said it, I believe it, that settles it
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