marshall1432
Banned
- Joined
- Jan 10, 2007
- Messages
- 80
1. For the function f(x) = x2 + 5x - 5, find and simplify the difference quotient:
f(x) - f(1)
------------
x-1
(x2+5x-5) - (1+5-5)
-----------------------
x-1
(x2+5x-5) - (1)
------------------
x-1
now im stuck. i cant find two numbers that multiply to be -5 and add to be 5. the only ones i can think of are the numbers 5 and 1 but that wont work will it?
2. Use your graphing calculator to approximate the point at which the function f(x) = -3x3 + 5x2 - 1 has a local maximum value. Give both coordinates rounded to two decimal places.
i got an error message after i converted it to a y= formula.
3. The perimeter of a rectangle with width x is 50 feet. The function below gives the area of the rectangle as a function of x.
A(x) = -x2 + 25x
Use your graphing calculator to find the value of x which maximizes the area. Round your answer to two decimal places.
the same thing with this one. i got another error message, syntax.
can anyone help me with these 3? thanks
f(x) - f(1)
------------
x-1
(x2+5x-5) - (1+5-5)
-----------------------
x-1
(x2+5x-5) - (1)
------------------
x-1
now im stuck. i cant find two numbers that multiply to be -5 and add to be 5. the only ones i can think of are the numbers 5 and 1 but that wont work will it?
2. Use your graphing calculator to approximate the point at which the function f(x) = -3x3 + 5x2 - 1 has a local maximum value. Give both coordinates rounded to two decimal places.
i got an error message after i converted it to a y= formula.
3. The perimeter of a rectangle with width x is 50 feet. The function below gives the area of the rectangle as a function of x.
A(x) = -x2 + 25x
Use your graphing calculator to find the value of x which maximizes the area. Round your answer to two decimal places.
the same thing with this one. i got another error message, syntax.
can anyone help me with these 3? thanks