16:00
1 of 5
Higher
Calculator
A20 Iteration
Question 1 · 5 marks
Spec and skills
Paper scope: Papers 2/3: calculator practice
Spec A20
Spec A18
Original practice question
Answer and supported method checks
The iteration formula
x
n
+
1
=
3
+
4
x
n
x_{n+1} = 3 + \dfrac{4}{x_n}
x
n
+
1
=
3
+
x
n
4
is used with
x
1
=
1
x_1 = 1
x
1
=
1
.
(a)
Work out
x
4
x_4
x
4
.
Give your answer to 2 decimal places.
2 marks