GCSE Maths Practice: substitution

Question 2 of 10

This question asks you to identify all equivalent ways of evaluating an algebraic expression with negative numbers.

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\( \text{Which of the following are correct values of } 2a^2 - b \text{ when } a = -3, b = 5? \)

Select all correct options:

Substitute numbers, compute squares, then simplify. Verify each option to see if it equals the same value.

Recognize equivalent forms: direct substitution, expanded multiplication, or final result. Check each carefully.