Approximate solution

Definition

A value read from a graph that is close to the exact value but may be limited by the graph's scale and drawing accuracy.

Used by AQA, Edexcel and OCR

Specification A18, A20 · Paper 1, Paper 2, Paper 3

A solution estimated from a graph or rounded decimal calculation rather than given exactly.
For AQA, solving by factorising and finding approximate solutions from a graph are additional Foundation content. Higher-tier work also includes equations that first require rearrangement, completing the square and the quadratic formula.
Revise: Quadratic Equations
A numerical value sufficiently close to an exact solution for a stated degree of accuracy.
Revise: Iterative Methods

1
Show an approximate solution with guide lines to the axes and give a sensible level of accuracy for the graph's scale.

Create a free account to read GCSE Mathematics revision notes for your exam board and track your progress.

Specification A14, A18, A20 · Paper 1, Paper 2, Paper 3

A value read from a graph rather than obtained exactly by algebraic calculation.
Revise: Real Context Graphs
Revise: Solving Quadratic Equations: Graphical Methods
A value close to an exact solution, usually stated to a specified degree of accuracy.
Revise: Iterative Methods