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If (f(x)=x^2+2) and (g(x)=x^2-2) then what is the value of ((fg)(0))?

Answer and explanation

Correct answer: \(-4)

The direct answer is option A, \(-4\). A product function is evaluated by multiplying the separate function values: \((fg)(x)=f(x)g(x)\). Put \(x=0\) into the first function: \(f(0)=0^2+2=2\). Put \(x=0\) into the second function: \(g(0)=0^2-2=-2\). Now multiply: \((fg)(0)=2\times(-2)=-4\). Therefore option A is correct. Option B, 0, would be obtained only if one factor were zero, but the factors are 2 and \(-2\), not zero. Option C, 4, ignores the negative sign in \(g(0)\), because \(2\times2=4\) but the second value is actually \(-2\). Option D, \(-2\), uses only one value and does not perform the required multiplication. The important distinction is that \((fg)(0)\) means product, not composition; composition would be written differently. Memory cue: evaluate each function first, then multiply.

Related tags

Relations-FunctionsAlgebra-Real-FunctionsProduct-Value

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