If (p(x)=2x-5), what is (p(5))?
Answer and explanation
Correct answer: 5
Given \(p(x)=2x-5\), substitute 5 for \(x\): \(p(5)=2\times5-5=10-5=5\). Therefore, the correct answer is 5. The value 10 is only \(2\times5\); the subtraction of 5 has not yet been done. Exam tip: To evaluate a polynomial, replace every \(x\) with the given number and then simplify.
Frequently asked questions
What is the correct answer to this question?
5
Why is this the correct answer?
Given \(p(x)=2x-5\), substitute 5 for \(x\): \(p(5)=2\times5-5=10-5=5\). Therefore, the correct answer is 5. The value 10 is only \(2\times5\); the subtraction of 5 has not yet been done. Exam tip: To evaluate a polynomial, replace every \(x\) with the given number and then simplify.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Linear polynomials.
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