Mathematics for IGCSE & O level - Algebraic Manipulation (Section 5 - No. 34)

Which expression is equivalent to x^2 - 9?

(x - 3)(x - 3)

(x + 3)(x + 3)

(x + 3)(x - 3)

(x - 9)(x + 1)

解释

This is a difference of squares: (x+3)(x-3) = x^2 - 9

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