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Find the domain and range of the function f(x) = cbrt-x+7.

Mathematics

ScanSolve AI Answer

Answer

(−∞,∞)(-\infty, \infty)

Step-by-step solution

2 steps

To find the domain and range of the function f(x)=−x+73f(x) = \sqrt[3]{-x+7}:

  1. Determine the domain.

    The function involves a cube root. Unlike square roots, a cube root can take any real number (positive, negative, or zero) as its argument. There are no restrictions on the expression inside a cube root.
    Therefore, the expression −x+7-x+7 can be any real number.
    The domain of f(x)f(x) is all real numbers.
    In interval notation, this is (−∞,∞)(-\infty, \infty).

  2. Determine the range.

    Let y=f(x)y = f(x). So, y=−x+73y = \sqrt[3]{-x+7}.
    To find the range, we can try to express xx in terms of yy:
    First, cube both sides of the equation:

    y3=−x+7y^3 = -x+7

    Now, solve for xx:

    x=7−y3x = 7 - y^3

    Since y3y^3 can take any real value (as yy can be any real number), the expression 7−y37-y^3 can also take any real value. This means that for any real value of yy, there is a corresponding real value of xx.
    Therefore, the range of f(x)f(x) is all real numbers.
    In interval notation, this is (−∞,∞)(-\infty, \infty).

    The domain of f(x)f(x) is (−∞,∞)\boxed{(-\infty, \infty)}.
    The range of f(x)f(x) is (−∞,∞)\boxed{(-\infty, \infty)}.

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