GCSE Maths Practice: substitution

Question 8 of 10

This question practices substitution into expressions involving squares and multiplication with negative numbers.

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\( \text{Evaluate } x^2y^2 - z^2 \text{ when } x = 2, y = -1, z = 3 \)

Choose one option:

Calculate x^2 and y^2 separately, multiply, then subtract z^2. Check each step for sign errors.

Compute each square first, then multiply and subtract carefully, paying attention to signs.