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Math Help - Algebra III/trig 2 problems

  1. #1
    hatemath101
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    Algebra III/trig 2 problems

    I need help on these two problems my teacher gave us. I'm already failing the class but I need at least one good grade. Directions: A) f+g(x)
    B) f-g(x) C) fg(x) D) F/g(x) Find the domain

    1. f(x)=2x-5 g(x)=2-x
    A=
    B=
    C=
    D=


    2. f(x)=2x-5 g(x)=4
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by hatemath101 View Post
    I need help on these two problems my teacher gave us. I'm already failing the class but I need at least one good grade. Directions: A) f+g(x)
    B) f-g(x) C) fg(x) D) F/g(x) Find the domain

    1. f(x)=2x-5 g(x)=2-x
    A=
    B=
    C=
    D=


    2. f(x)=2x-5 g(x)=4
    (f + g)(x) = f(x) + g(x)

    (f - g)(x) = f(x) - g(x)

    fg(x) = f(x)g(x)

    \frac fg(x) = \frac {f(x)}{g(x)}

    we are dealing with polynomials here, so the domains for A, B, and C are all real x, that is x \in (- \infty, \infty)

    for D, obviously the denominator cannot be zero, so the domain is all real x such that g(x) \ne 0
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