Skip to content

Course home

3.8 Numerical Methods (A-level only)

3.8 Numerical Methods (A-level only)

EasyMediumHard
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109
Question 20

f(x)=2x3−6x+3xx>0f(x) = 2x^3 - 6x + 3\sqrt{x} \quad x > 0f(x)=2x3−6x+3x​x>0

a.

Show that f(x)=0f(x) = 0f(x)=0 has a root in the interval [1.2,1.3][1.2, 1.3][1.2,1.3]

[2]
b.

Find f′(x)f'(x)f′(x)

[3]
c.

Starting with x0=1.25x_0 = 1.25x0​=1.25, apply the Newton-Raphson procedure once to find an approximate solution to the equation f(x)=0f(x) = 0f(x)=0 giving your answer to 3 decimal places.

[3]
Markscheme

3.8 Numerical Methods (A-level only) Questions

  1. A Level
  2. /Maths
  3. /3.8 Numerical Methods (A-level only)

129 exam-style questions on WJEC A Level Maths 3.8 Numerical Methods (A-level only), covering 3.8.1 Numerical Methods (A-level only), 3.8.2 Numerical Methods (A-level only), 3.8.3 Numerical Methods (A-level only), 3.8.4 Numerical Methods (A-level only), and 3.8.5 Numerical Methods (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

Question bank