Mathematics for IGCSE & O level - Algebraic Manipulation (Section 5 - No. 31)

Simplify: (x+3)(x-3)

x^2 - 6x + 9

x^2 + 6x + 9

x^2 - 9

x^2 + 9

解释

Difference of squares (x+3)(x-3) = x^2 -9

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