Question

Can you evaluate an expression? and if so, please explain how to. thank you. <3

Answer 1

If an expression doesn't involve a variable, evaluating it simply means to simplify it, following PEMDAS rule. For example, if we start with

`2+3\cdot 5+(3+7)\cdot 2`

We perform parenthesis first:

`2+3\cdot 5+10\cdot 2`

Then multiplications:

`2+15+20`

And finally additions:

`37`

If, instead, an expression involves variables, evaluating the expression means to plug a specific value for the variable(s): for example, if we start with

`f(x,y)=3x+2xy`

If we choose x=4 and y=7 the expression becomes

`f(4,7)=3\cdot 4+2\cdot 4\cdot 7=12+56=68`