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2 September, 23:09

Let f (x) = - 4x and g (x) = 5x2. Andrew finds the composition [f o g] (x) as shown below. What error did Andrew make? = 5 (-4x) 2 = 5 (16x2) = 80x2

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  1. 3 September, 02:49
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    We are given

    (x) = - 4x and g (x) = 5x²

    The composition of f with g should be done this way:

    [f o g] (x) = f [ g (x) ]

    = f (5x ²)

    = - 4 (5x²)

    - 20 x²
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