If f(x) = 3x and g(x) = 7x-1, what is (fog)(4)?

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If f(x) = 3x and g(x) = 7x-1, what is (fog)(4)?

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  1. Answer:

    83

    Step-by-step explanation:

    solution:

    we have

    f(x)= 3x & g(x)= 7x-1

    now

    fog= f{g(x)}

    or, f(7x-1)

    or, 7.3x-1 = 21x-1

    so, fog(4)= 21*4-1=84-1=83

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