Need to calculate:The value of g(0) from the function g(x)={x−5 if x≤53x if

Formula used:
Some functions are defined by different equations for various parts for their domains.
Those functions are called piecewise-defined functions.
To solve the piecewise-defined function for an input, we will determine that which part of the domain it belongs to and use the appropriate formula for that part of the domain.
Calculation:
Consider the provided function,
$g(x)=\{\begin{array}{l}x-5ifx\le 5\\ 3xifx>5\end{array}$
The function provided is defined in multiple equations.
Therefore, to determine g(0) identify in which equation 0 will lie.
It lies in the interval $x\le 5$. Therefore, to determine the value of g(0), $g(x)=x—5$ will be used.
Substitute $x=0$ into the equation $g(x)=x—5$.
$g(x)=x-5$
$g(0)=0-5=-5$
Hence, the value of g(0) is —5.