If (N(x)=58-2x), what is (N(9))?
Answer and explanation
Correct answer: \(40\)
Given \(N(x)=58-2x\). Substituting \(x=9\), we get \(N(9)=58-2(9)=58-18=40\). Hence, the correct answer is \(40\). The close distractor \(42\) would result from subtracting 16, but \(2\times9=18\). Exam tip: while evaluating a function, substitute the given value first and complete multiplication before subtraction.
Frequently asked questions
What is the correct answer to this question?
\(40\)
Why is this the correct answer?
Given \(N(x)=58-2x\). Substituting \(x=9\), we get \(N(9)=58-2(9)=58-18=40\). Hence, the correct answer is \(40\). The close distractor \(42\) would result from subtracting 16, but \(2\times9=18\). Exam tip: while evaluating a function, substitute the given value first and complete multiplication before subtraction.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Linear growth and decay.
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