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What is the simplified form of ( (x-2)(x+2)(x^2+4) )?

Answer and explanation

Correct answer: (x^4-16)

The direct answer is option C: \(x^4-16\). Start with the identity \((a-b)(a+b)=a^2-b^2\). Here, \((x-2)(x+2)=x^2-4\). Now apply the same identity again: \((x^2-4)(x^2+4)=(x^2)^2-4^2=x^4-16\). Therefore C is correct. Option A, \(x^4+16\), incorrectly changes subtraction into addition. Option B, \(x^4-8\), uses the wrong constant because \(4^2=16\), not 8. Option C follows both difference-of-squares steps exactly. Option D, \(x^4+8x^2+16\), is the expansion of \((x^2+4)^2\), not the given product. Memory cue: opposite signs in both pairs mean difference of squares; square the two terms and subtract.

Related tags

Nested IdentityDifference Of SquaresQuartic

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