91Ó°ÊÓ

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

In $\left|3−h\right|+13$, h is the variable which is the unknown quantity.

Constants: - In any expression or equation constant are the values which are fixed.

While performing addition in an equation, the same kind of elements or like terms are added together.

Absolute value: - Absolute value of any quantity simply means the positive value of that quantity.

Example: -

Consider a variable x. Here, x can be both positive or negative but $\left|x\right|$will always be positive and hence the absolute value.

Given $\left|3−h\right|+13$and $h=5$.

Put $h=5$in $\left|3−h\right|+13$.

$\left|3−5\right|+13=\left|−2\right|+13$

Since $\left|−2\right|$will always give a positive value. So,

role="math" localid="1642187668168" $\begin{array}{c}\left|−2\right|+13=2+13\\ =15\end{array}$

Hence, the value of $\left|3−h\right|+13$for $h=5$is $15$.