Edexcel IGCSE Math A Higher 2.3 C Substitution in Expressions and Formulae Questions

Practise substituting positive and negative integers, decimals and fractions while preserving signs, brackets and operation order.

Exam points

place substituted negative values in brackets before multiplying or raising powers
follow order of operations after replacing every letter with its stated value
diagnose sign errors and check a result by repeating the substitution step by step

[Maximum number: 2]

Work out the value of w when y=-2

$5(-2)^2-(-2)^3=20-(-8)=28$
Final answer: 28

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