Function notation

From Math Wiki

Jump to: navigation, search

Example: y = 2x + 5

1. Name the function

P(x) = 2x + 5

2. Add in the value of X

P(4) = 2(4) + 5

3. Solve

P(4) = 13


Domain is all the possible x-values, or inputs a function can have. Suppose you are trying to find the domain of this problem: The number of miles you can travel is a function of the gallons of gas you put in your car.

  • First you have to identify the independent variable. Since the number of miles is dependent on the gallons of gas, gallons is your independent variable.
  • Then you need to think of all reasonable inputs, or x-values for number of gallons a car can hold. In your domain you need to inclde the lowest value and the highest possible x-values.
  • Since a car can not hold less than 0 gallons, but can still hold 0, and this particulae car can hold a max of 25 gallons we would say that the domain for this problem is: the number of gallons is less than or equal to 25, and greater than or equal to 0.

Contributors

AleeV09, MaddieT09, RachelZ09

Retrieved from "http://mathfor.us/Function_notation"
Personal tools