Skip to content
MathsGenie logo
Open app

Course home

  1. GCSE
  2. Maths WJEC
  3. Question bank

Iteration

EasyMediumHard
123456789101112131415161718192021222324252627282930
Question 22
a.

Show that the equation x3+10x=2x^3 + 10x = 2x3+10x=2 has a solution between x=0x = 0x=0 and x=1x = 1x=1.

[2]
b.

Show that the equation x3+10x=2x^3 + 10x = 2x3+10x=2 can be rearranged to give: x=15−x310\displaystyle x = \frac{1}{5} - \frac{x^3}{10}x=51​−10x3​

[1]
c.

Starting with x0=0x_0 = 0x0​=0, use the iteration formula xn+1=15−xn310\displaystyle x_{n+1} = \frac{1}{5} - \frac{x_n^3}{10}xn+1​=51​−10xn3​​ twice to find an estimate for the solution to x3+10x=2x^3 + 10x = 2x3+10x=2.

[3]

Iteration Questions

  1. GCSE
  2. /Maths
  3. /Iteration