Edexcel IGCSE Maths 复习笔记 3.10.1 Solving Equations using Graphs

Edexcel IGCSE Maths 复习笔记 3.10.1 Solving Equations using Graphs

How do we use graphs to solve equations?

  • Solutions are always read off the x-axis
  • Solutions of f(x) = 0 are where the graph of y = f(x) cuts the x-axis
  • If given g(x)=0 instead (Q: “by drawing a suitable straight line”) then:
    • Rearrange into f(x) = mx + c and draw the line y = mx + c
    • Solutions are the x-coordinates of where the line crosses the curve 

      Note that solutions may also be called roots

     

Worked Example

5.7.1-Solving-equations-using-graphs-Worked-Example-1Cubic-Linear-Intersections-before

Worked Example

5.7.1-Solving-equations-using-graphs-Worked-Example-2Cubic-Linear-Intersections-after5.7.1-Solving-equations-using-graphs-Worked-Example-3

转载自savemyexam

 

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