Step by step
The question
Question: find the value of 3x + 2 when x = 4.
3x + 2
x = 4
1 Put the numbers in
We put 4 in place of x.
3x means 3 times x.
So we write a times sign.
= 3 × 4 + 2
3x = 3 × x
2 Times and divide
Times comes before plus.
Order: ( ) → x² √ → × ÷ → + −
3 times 4 is 12.
= 12 + 2
3 Plus and minus
12 plus 2 is 14.
= 14
So 3x + 2 is 14 when x = 4.
Let's look back.
First: put the numbers in.
Then: times and divide.
Last: plus and minus.
Answer
= 14