If (g(x)=90-4x), what is the value of (g(5)+g(12))?
Answer and explanation
Correct answer: 112
Given \(g(x)=90-4x\), \(g(5)=90-4(5)=70\) and \(g(12)=90-4(12)=42\). Therefore, \(g(5)+g(12)=70+42=112\), so option C is correct. An answer such as 106 may result from an error in subtraction or multiplication. Exam tip: substitute each input into the function separately before adding the outputs.
Frequently asked questions
What is the correct answer to this question?
112
Why is this the correct answer?
Given \(g(x)=90-4x\), \(g(5)=90-4(5)=70\) and \(g(12)=90-4(12)=42\). Therefore, \(g(5)+g(12)=70+42=112\), so option C is correct. An answer such as 106 may result from an error in subtraction or multiplication. Exam tip: substitute each input into the function separately before adding the outputs.
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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