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Precal

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Given f(x) and g(x) below, find:
(a) f + g (b) f – g (c) f*g (d) f/g
Please show all of your work.
f(x) = x + 5
g(x) = 5x^2+15x-3

  • Precal - ,

    just substitute f and g as needed

    f(x) + g(x) = (x+5) + (5x^2 + 15x - 3)
    = 5x^2 + 16x + 2


    f(x) + g(x) = (x+5) - (5x^2 + 15x - 3)
    = -5x^2 - 14x + 8

    f(x) * g(x) = (x+5) * (5x^2 + 15x - 3)
    = 5x^3 + 20x^2 + 72x - 15

    f(x) + g(x) = (x+5) / (5x^2 + 15x - 3)

  • Precal - ,

    perils of copy/paste:

    2nd and 4th lines should read f(x)-g(x) and f(x)/g(x)

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