Question

Given that ‘$n$’ is a variable and ‘$a$’, ‘$b$’ , ‘$c$’ are constants, choose the correct option:
$\begin{array}{cccc}1.& an+b& A.& \text{Constant}\\ 2.& a{n}^2+bn+c& B.& \text{Quadratic expression}\\ 3.& a& C.& \text{Linear expression}\end{array}$

• A. 1 - A, 2 - B, 3 - C
• B. 1 - B, 2 - A, 3 - C
• C. 1 - C, 2 - B, 3 - A
• D. 1 - A, 2 - C, 3 - B

Answer 1

The correct option is C 1 - C, 2 - B, 3 - A

A linear expression is an expression in which the degree of the variable is 1.
A quadratic expression is an expression in which the degree of the variable is 2.
An expression which contains only numbers and not variables is known as 'a constant'. We can say that the degree of the variable in a constant is 0.
Hence,
$an+b\to \text{Linear expression}$
$a{n}^2+bn+c\to \text{Quadratic expression}$
$a\to \text{Constant expression}$