MATH 1007 Lecture Notes - Lecture 2: Webct, Inverse Function, Linear Function

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Stuff for this course is not on webct go to: www. math. carleton. ca/~rmallick. The composiion of f and g is the funcion f g deined by: (f g)(x) = f( g(x) ) ** domain is where you can evaluate the funcion. Therefore, for composite funcions, like this one: the domain of f g is the set of all x in the domain of g s. t. (such that) that g(x) lies in the domain of f. Ex: f(x) = x2 + x + 1 g(x) = x3 so (f g)(x) A funcion is one-to-one if and only if no horizontal line intersects its graph more than once (horizontal line test) 1 general rule of inding inverse of f(x: write y = f(x, solve for x in terms of y (if possible, now interchange y and x, the resuling equaion is y = f-1 (x) Two lines are parallel if and only if they have the same slope!!

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