Monkeyseat
Full Member
- Joined
- Jul 3, 2005
- Messages
- 298
A few here:
1) -x^2 + 30x + 125
Goes to:
-1(x-15)^2 - 100
Or is it -1(x+15)^2 - 100?
In regard to Q1, after going on AlgebraHelp.com I realised it could be -1(x-15)^2 + 225 + 125 which will simplify to -1(x-15)^2 + 350 ?
This completed square shows the area of a zone, how do I find the maximum area from this? According to the answers it's 350 units but I don't know how to get this. I think it's when x=0 but I don't understand.
2) f(x) = 3x^2 + 12x + 17
Goes to:
f(x) = 3(x+2)^2 + 5
How do I "deduce the greatest value of 1/f(x)?"
3) y = 4x - x^2
Goes to:
y= -1(x-2)^2 + 4
Or is it -1(x+2)^2 + 4?
Many thanks for any help.
1) -x^2 + 30x + 125
Goes to:
-1(x-15)^2 - 100
Or is it -1(x+15)^2 - 100?
In regard to Q1, after going on AlgebraHelp.com I realised it could be -1(x-15)^2 + 225 + 125 which will simplify to -1(x-15)^2 + 350 ?
This completed square shows the area of a zone, how do I find the maximum area from this? According to the answers it's 350 units but I don't know how to get this. I think it's when x=0 but I don't understand.
2) f(x) = 3x^2 + 12x + 17
Goes to:
f(x) = 3(x+2)^2 + 5
How do I "deduce the greatest value of 1/f(x)?"
3) y = 4x - x^2
Goes to:
y= -1(x-2)^2 + 4
Or is it -1(x+2)^2 + 4?
Many thanks for any help.