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Edexcel 1MA1
Higher
Non-calculator
A7 Functions
Question 1 · 4 marks
Spec and skills
Paper scope: Paper 1: non-calculator practice
Spec A7
Spec A5
Original practice question
Answer and supported method checks
f
(
x
)
=
x
+
4
x
−
1
f(x) = \dfrac{x + 4}{x - 1}
f
(
x
)
=
x
−
1
x
+
4
,
for
x
≠
1
x \ne 1
x
=
1
.
(a)
Find
f
−
1
(
x
)
f^{-1}(x)
f
−
1
(
x
)
.
3 marks
x
xⁿ
a/b
√
π
(
)