Step by step
The question
Question: find g(2) for g(t) = 3t − 6.
g(t) = 3t − 6
g(t) is read "g of t".
It is a rule, called a function.
A number goes in for t.
The rule gives one answer out.
g(t) = "g of t"
t goes in → an answer comes out
1 Put the number in
g(2) means: put 2 in place of every t.
We write it in brackets.
g(2) = 3(2) − 6
2 Times and divide
Times comes before minus.
Order: ( ) → x² √ → × ÷ → + −
3(2) = 3 × 2
3(2) means 3 times 2.
3 times 2 is 6.
= 6 − 6
3 Plus and minus
6 minus 6 is 0.
g(2) = 0
So g(2) = 0.
Let's look back.
First: put the number in.
Then: times and divide.
Last: plus and minus.
Answer
g(2) = 0