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27-28 Find an explicit formula for f−1 and use it to graph f−1, f, and the line y = x on the same screen. To check your work, see whether the graphs of f and f−1 are reflections about the line. 27. f(x) = x4 + 1, x ⩾ 0 28. f(x) = 2 − ex

27-28 Find an explicit formula for f−1 and use it to graph f−1, f, and the line y = x on the same screen. To check your work, see whether the graphs of f and f−1 are reflections about the line. 27. f(x) = x4 + 1, x ⩾ 0 28. f(x) = 2 − ex

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M 27-28 = Find an explicit formula for f − 1 and use it to graph f − 1 , f , and the line y = x on the same screen. To check your work, see whether the graphs of f and f − 1 are reflections about the line. 27. f ( x ) = x 4 + 1 , x ⩾ 0 28. f ( x ) = 2 − e x

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