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23 November, 18:40

Let f (x) = 4x + 3 and g (x) = - 2x + 5. Find (f x g) (5)

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  1. 23 November, 20:44
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    F (x) = 4x + 3

    the domain: Df = R

    g (x) = - 2x + 5

    the domain: Dg = R

    Df = Dg therefore (f · g) (x) = f (x) · g (x)

    f (5) = 4 · 5 + 3 = 20 + 3 = 23

    g (5) = - 2 · 5 + 5 = - 10 + 5 = - 5

    (f · g) (5) = f (5) · g (5) = 23 · (-5) = - 115
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