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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 5 - No. 44)
What is the result of expanding (a + b)(a - b)?
a^2 + b^2
a^2 - b^2
a^2 + 2ab + b^2
a^2 - 2ab + b^2
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(a+b)(a-b) = a^2 - b^2
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