Mathematics for IGCSE & O level - Algebraic Manipulation (Section 7 - No. 2)

What is the result of (x + 4)(x - 4)?

x^2 + 8x + 16

x^2 - 8x - 16

x^2 - 16

x^2 + 16

解释

This is a difference of squares. (x+4)(x-4) = x^2 - 16

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