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

解释

This is a difference of squares: (x+y)(x-y) = x^2 - y^2.

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