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If (f(x)=x+2) and (g(x)=x-2), what is ((f+g)(x)\cdot(f-g)(x))?

Answer and explanation

Correct answer: (8x)

The direct answer is A: \(8x\). First calculate each function sum and difference. \((f+g)(x)=(x+2)+(x-2)=2x\). Next, \((f-g)(x)=(x+2)-(x-2)=x+2-x+2=4\). Their product is therefore \((2x)(4)=8x\). Option A is correct. Option B, \(4x\), leaves out a factor of 2 and would be only half the required product. Option C, \(x^2-4\), is the product \((x+2)(x-2)"), not the requested product of the sum and difference. Option D, \(2x+4\), is just twice \(f(x)\), not the product. Work inside each bracket before multiplying; this prevents confusing \(f+g\) with \(fg\).

Related tags

Relations FunctionsCombined OperationsProduct

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