How do you evaluate #3x + 15# when x= 12?

3 Answers
thelittlestleafeon
Mar 4, 2018

Substitute the given value for x into the equation and then solve.

Explanation:

In this case the given x-value is 12, so we put 12 in place of the x giving us the expression #3(12)+15#. Then we solve according to PEMDAS.
Parentheses: in this case, there is nothing to solve inside of the parentheses
Exponents: none
Multiplication: here we multiply #3*12=36#
Addition: now we add #36+15=51#
Subtraction: none

So the final answer is 51.

Kelly H. · Stefan V.
Mar 4, 2018

#3(12) + 15 = 51#

Explanation:

Replace the #x# with the #12#. Multiply the #3# by the #12# and then add #15# to that answer.

Meave60
Mar 4, 2018

#3(12)+15=color(blue)51#

Explanation:

Substitute #12# for #x# in the equation.

#3(12)+15=#

#36+15=#

#51#

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