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    Brittney H's Avatar
    Brittney H Posts: 1, Reputation: 1
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    #1

    Nov 29, 2006, 10:03 PM
    functions mixed with some inequalities
    here's a twofer (2in1)

    1) How do I go about solving f(x)6x^2-5x and g(x)2x+3, solve f(x)<g(x)


    2) A word prob. I can't get... The revenue achieved by selling x graphing calc. is figured to be x(48-0.2x) dollars. The cost of each calc. is $40. How many graphing calc must be sold to make a profit (revenue-cost) of at least $63.80.
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    Nov 30, 2006, 04:21 AM
    For your first question you just plug in the equations, group like terms, make one side 0, factorize and solve.

    For the second one, the equation is x(48-0.2x)-40x = 63.8, expand the brackets, group like terms, make it = 0, factorize and solve for your answer.

    Instead of factorizing, you can use the equation you should have to solve.
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