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# H Alg2 091409

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Functions - identifying and notation

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### H Alg2 091409

1. 1. September 14, 2009 Warm ­ Up Do you remember the  slope­intercept form of  a linear equation?   Use that form to find  the equation of the  graph to the right.
2. 2. Functions Polynomial Functions Linear Functions Quadratic Functions Cubic Functions Exponential Functions Logarithmic Functions Rational Functions Radical Functions Trigonometric Functions
3. 3. What Makes a Function ­ Part 1 x y f (x) Input Output Domain Range
4. 4. What Makes a Function ­ Part 2 A function is a relation where the input  value does not repeat (outputs can).
5. 5. Function Notation f (x) means "function of x" NOT f times x ! y = mx + b f (x) = mx + b } mean same thing Doesn't have to be "f".  For example: g(x) = mx + b still mean the same thing h(x) = mx + b
6. 6. How to Use Function Notation Evaluate the function when x = ­3 f (x) = x2 + 4x ­ 5 g(x) = 5x h(x) = 7
7. 7. HW: pg. 76 #1­13, 16­23, 34­39 Do HW on loose leaf It will be collected