precalc

Letf(x)=2x2 –5 and g(x)=x+4.
(a) Find the composite function ( f o g)(x) and simplify. Show work.
(b)Find (f og)(3).Showwork.

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  1. (fog) = f(g) = 2g^2-5 = 2(x+4)^2-5
    now just expand that out

    Now just plug in x=3 for (b).

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