Mathematics for IGCSE & O level - Algebraic Manipulation (Section 6 - No. 26)
What is the expanded form of (x+y)(x-y)?
x^2 + y^2
x^2 - y^2
x^2 + 2xy + y^2
x^2 - 2xy + y^2
Explanation
This is a difference of squares: (x+y)(x-y) = x^2 - y^2.
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