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 July 21st, 2008, 09:24 AM #1 Newbie   Joined: Jul 2008 Posts: 2 Thanks: 0 i am so stuck on these math problems [color=#FF0000]I dont expect for you to answer all of them but anything you do answer would be really appreciated, these are my study guided problems for a math final and i am basically stuck on this sheet theres 30 sheets and this is just one of them so you can imagine wat i have to do. THANKS IN ADVANCE![/color] 2. The domain of f where f(x) = 1/square root of 4-x^2 is _______ 6. f: A?B is a function from A to B and f(A) = B then f is called _______ 7. f = { (a,1), (b,2), (c,3) } then f is______ 11. If f = {(1, a) (2, b), (3, c) (4, d)} then its range is _______ 13. f is a function defined by f(x) = 3x^3-7x^2+6x+1/2x^3-3x+9 then f is called _______ 15. A function f(x) = [x] then f(-3/4) = _______ 17. f is a function defined by f(x) = -x/5 and g is a function defined by g(x) = 7-3x then 4g - 5f = _______ 20. The domain of f = 1/4x+1 is _______ July 21st, 2008, 12:16 PM #2 Senior Member   Joined: Apr 2008 Posts: 435 Thanks: 0 Re: i am so stuck on these math problems I'll start with the first and last problems about domain. Realistically speaking, you cannot divide by zero, nor can you take the square root of a negative number. Thus 1 / (4 - x^2)^.5 has restrictions. When x = 2, for example, we would be dividing by zero. When x is greater than 2, we would be taking the root of a negative number. Likewise, when x = -2 or when x is less than -2 we have problems. Thus the domain of the function, which is to say the input (x) values that can be inserted into the function, is from -2 to 2 (not including either). For the last one, there are no square roots. But we can have a situation where we divide by zero. In order to avoid that, 4x + 1 cannot be equal to 0... Tags math, problems, stuck Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post kaybees17 Advanced Statistics 2 October 14th, 2013 09:19 PM jkh1919 Calculus 3 November 3rd, 2012 12:18 PM hagtos Elementary Math 2 June 21st, 2012 08:35 AM redwood Physics 2 October 27th, 2007 06:42 AM mathboy77 Algebra 2 September 7th, 2007 07:59 AM

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