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Edexcel IGCSE Math B 4.D Domain & range Question Bank

Practise stating domains and ranges from function rules, including excluded denominator values and correct use of x, y or f(x).

Syllabus
First assessment 2018
Course
Math B 4MB1

Exam points

  • state excluded x-values by setting linear denominators not equal to zero
  • write ranges with y or f(x), avoiding domain notation for output restrictions
  • interpret inequalities

4.D Domain and range question 1

[Maximum number: 1]

Here are the functions f, g and h.
f:x↦2x−5,x>1,g:x↦7−8x2x+1,h:x↦2x2+4x−5,x>−1.\begin{aligned}f:x&\mapsto 2x-5,\quad x>1,\\g:x&\mapsto 7-\frac{8x}{2x+1},\\h:x&\mapsto 2x^2+4x-5,\quad x>-1.\end{aligned}

Write down the value of x for which g is not defined.

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