91Ó°ÊÓ

The algebraic expression is obtained from verbal expression using mathematical operators like addition$+$, subtraction $-$, multiplication $×$, division $÷$ and many such more and variable.

In any expression or equation, the variable is an unknown quantity. It may be any alphabet or any special symbol.

In the expression $4x+1$, the unknown quantity is x. So, the variable in this expression is x. 4 and 1 are constants values.

Consider the provided verbal expression.

Four times the sum of a number and 5.

Let the number be x.

The mathematical operators corresponding to times ismultiplication $×$ and to sum is addition $+$.

Express the verbal expression for sum of a number and 5 as $x+5$.

Now, this obtained expression is multiplied by 4. The algebraic expression obtained is $4\left(x+5\right)$.

Hence, the algebraic expression is $4\left(x+5\right)$.