How do you evaluate #3x + 15# when x= 12?
Substitute the given value for x into the equation and then solve.
In this case the given x-value is 12, so we put 12 in place of the x giving us the expression
Parentheses: in this case, there is nothing to solve inside of the parentheses
Multiplication: here we multiply
Addition: now we add
So the final answer is 51.