If (p(x)=7x-9), what is the value of (p(2)-p(1))?
Answer and explanation
Correct answer: 7
Given \(p(x)=7x-9\), \(p(2)=7\times2-9=5\) and \(p(1)=7\times1-9=-2\). Hence, \(p(2)-p(1)=5-(-2)=7\). Option 9 is only the constant term’s number, not the required difference. Exam tip: After substituting values in a polynomial, handle subtraction of a negative number carefully.
Frequently asked questions
What is the correct answer to this question?
7
Why is this the correct answer?
Given \(p(x)=7x-9\), \(p(2)=7\times2-9=5\) and \(p(1)=7\times1-9=-2\). Hence, \(p(2)-p(1)=5-(-2)=7\). Option 9 is only the constant term’s number, not the required difference. Exam tip: After substituting values in a polynomial, handle subtraction of a negative number carefully.
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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