Given  f(x) = 2x2 + 1  and  g(x) = 4x − 5,  find the following. (a)     f(g(2))       (b)     f(g(x))       (c)     g(f(x))

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.