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If \(f(x)=x^2+4x\), what is the value of \(f(-4)\)?

Answer and explanation

Correct answer: 0

Substituting \(x=-4\), we get \(f(-4)=(-4)^2+4(-4)=16-16=0\). Therefore, the correct answer is 0. The value 16 results from calculating only \((-4)^2\) and ignoring the term \(4x=-16\). Exam tip: the square of a negative number is positive, but the linear term \(4x\) remains negative here.

Related tags

PolynomialsSubstitutionFunction EvaluationPolynomials In One VariableMathematicsClass 10 Mcq

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