Step by step
The question
Question: find the value of 2a + b when a = 6 and b = 3.
2a + b
a = 6, b = 3
1 Put the numbers in
We put 6 in place of a and 3 in place of b.
2a means 2 times a.
So we write a times sign.
= 2 × 6 + 3
2a = 2 × a
2 Times and divide
Times comes before plus.
Order: ( ) → x² √ → × ÷ → + −
2 times 6 is 12.
= 12 + 3
3 Plus and minus
12 plus 3 is 15.
= 15
So 2a + b is 15 when a = 6 and b = 3.
Let's look back.
First: put the numbers in.
Then: times and divide.
Last: plus and minus.
Answer
= 15