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5 October, 09:36

If f (x) = x^ + 3x-1 and g (x) = 2x + 3. find fog

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  1. 5 October, 10:32
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    The correct equation is fog = 4x^2 + 18x + 17

    Step-by-step explanation:

    In order to find fog, you need to put the g (x) equation in for x in the f (x) equation. Then simplify.

    f (x) = x^2 + 3x - 1

    fog = (2x + 3) ^2 + 3 (2x + 3) - 1

    fog = (4x^2 + 12x + 9) + (6x + 9) - 1

    fog = 4x^2 + 18x + 17
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