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Completely factorise (x^4-16).

Answer and explanation

Correct answer: ((x-2)(x+2)(x^2+4))

Complete factorisation means continuing until no factor can be split further over the usual integer factors. First, \(x^4-16\) is a difference of squares: \( (x^2)^2-4^2=(x^2-4)(x^2+4)\). The factor \(x^2-4\) is also a difference of squares, so it becomes \( (x-2)(x+2)\). Hence the complete factorisation is \( (x-2)(x+2)(x^2+4)\), option B.

The expression \(x^2+4\) cannot be factored further using integer linear factors, while stopping at \( (x^2-4)(x^2+4)\) is only partial factorisation. Option C uses 4 and 16 incorrectly as a difference of squares, and D does not expand to the original polynomial. Thus the supplied answer is correct.

Related tags

Complete FactorisationDifference Of SquaresExpert

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