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1.5.8 Composite and inverse functions (A-level only)
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Question 18
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Markscheme
f(x)=5x+2x−4x≥6 f(x) = \frac{5x+2}{x-4} \quad x \geq 6
f
(
x
)
=
x
−
4
5
x
+
2
x
≥
6
a.
Find
ff(6)ff(6)
f
f
(
6
)
[2]
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3
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b.
State the range of
ff
f
.
[1]
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3
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c.
Find
f−1(x)f^{-1}(x)
f
−
1
(
x
)
and state its domain
[3]
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3
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1.5.8 Composite and inverse functions (A-level only) Questions
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1.5.8 Composite and inverse functions (A-level only)
