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1.5.8 Composite and inverse functions (A-level only)

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Question 54

A manufacturer models the production cost CCC (in thousands of dollars) of a specialty polymer as a function of the weight www (in tons) produced, defined by:

C(w)=15(w2+6),w≥0 C(w) = \frac{1}{5}(w^2 + 6), \quad w \ge 0 C(w)=51​(w2+6),w≥0
a.

Determine the range of the cost function CCC.

[2]
bi.

Find an expression for the inverse function C−1(x)C^{-1}(x)C−1(x).

[2]
bii.

State the range of C−1(x)C^{-1}(x)C−1(x).

[1]
c.

State the geometric transformation that maps the graph of y=C(w)y = C(w)y=C(w) onto the graph of y=C−1(w)y = C^{-1}(w)y=C−1(w).

[1]
d.

Find the coordinates of the points of intersection of the graphs of y=C(x)y = C(x)y=C(x) and y=C−1(x)y = C^{-1}(x)y=C−1(x).

[3]

1.5.8 Composite and inverse functions (A-level only) Questions

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