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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 3 - No. 49)

The expression x²-14x+49 can be obtained by multiplying a bracket by itself, what is that bracket?
(x+7)
(x-7)
(x+7) and (x-7)
(x-7) and (x-7)

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(x-7)² = x²-14x+49

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