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What is the domain of (f(x)=\frac{1}{x^2+4x+4})?

Answer and explanation

Correct answer: (\mathbb{R}\setminus{-2})

A fraction is undefined wherever its denominator is zero. Factor the denominator: x^2+4x+4=(x+2)^2. This square equals zero only when x+2=0, which gives x=-2. Every other real number makes the denominator positive and therefore gives a defined function value. Thus the domain is all real numbers except -2, matching option A.

The excluded value must not be confused with 2 or -4. Substituting x=2 gives a denominator of 16, and substituting x=-4 also gives 4, so both are allowed. At x=-2, however, the denominator is 0 and the expression would require division by zero. In set notation the domain is \\(\mathbb{R}\setminus\{-2\}\\.

Related tags

DomainRationalPerfect-Square

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