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Question 10
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Markscheme
f(x)=2x+5x−3x≥5 f(x) = \frac{2x+5}{x-3} \quad x \geq 5
f
(
x
)
=
x
−
3
2
x
+
5
x
≥
5
a.
Find
ff(5)ff(5)
f
f
(
5
)
[2]
Write your answer here...
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3
Grade answer
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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Markscheme
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3
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Functions and Graphs Questions
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