Substitute x with 5: We are given the expression 3×(x+4) and we need to find its value when x=5. First, we substitute x with 5 in the expression.Calculation: 3×(5+4)
Perform addition: Now we perform the operation inside the parentheses, which is addition.Calculation: 3×(5+4)=3×9
Multiply to get final value: Next, we multiply 3 by 9 to get the final value.Calculation: 3×9=27