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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 7 - No. 39)

What is the result of expanding (a-b)^2?
a^2 + b^2
a^2 - b^2
a^2 - 2ab + b^2
a^2 + 2ab + b^2

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(a-b)^2 = (a-b)(a-b) = a^2 -2ab + b^2

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