GCSE Maths Practice: substitution

Question 5 of 10

This question practices the expansion and evaluation of perfect square expressions.

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

Select all correct options:

Compute x^2, 2xy, and y^2 separately, then sum. Recognize perfect squares to check your answer.

Remember the identity (x+y)^2 = x^2 + 2xy + y^2. Substituting values helps simplify quickly.