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Edexcel IGCSE Math B 4.C Function notation Question Bank

Practise substituting numbers and algebraic inputs into f(x), g(x) and mapping notation, then simplifying the resulting values.

Syllabus
First assessment 2018
Course
Math B 4MB1

Exam points

  • substitute positive, negative or algebraic inputs into f(x) and g(x)
  • simplify expressions
  • evaluate functions given in x ↦ form, including fractional expressions

4.C Function notation question 1

[Maximum number: 1]

The equation of the straight line L is
y=2-3x.

The functions f and g are defined as
f:x↦2−3x,g:x↦3+x1−2x,x≠12.f:x\mapsto2-3x, \qquad g:x\mapsto\frac{3+x}{1-2x},\quad x\ne\frac12.
Find g(-2).

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