MAT135Y5 Lecture Notes - Lecture 3: Rational Number, Piecewise, Negative Number
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Mat135y lecture 3 - section 1. 1 cont"d and section 1. 2. Q: what"s the domain of each function? a) b) c) = 1 (x)g (x)h (x)m = x 2 1 x 3 a) g (x) So, domain = , ) x x. 2 0 ( 2. So, domain = , 3) (x)m = x 2 1 c) x 2 1 0 ** x 2 = x = x| x| | a a x a x| ( 1 [ x+2. A function takes all input values, which a part of the domain of the function and maps it to only one output value. Draw a vertical line through the graph. For x value of the graph the vertical line touches the graph only once! arabola (facing down) x. = 1 2 = 1 so, ( , 1) 1 x 2 + 1 (x) f f (1) 2 + 1 = 0 pretend" f(1) 1) F ind f( ), f(1), f(2), and f(0)