Quest of Nine

The Book

Combining functions

You can combine two or more functions to change a number in different ways.

inputfunction 1function 2output
7arrow+4x3arrow33
8arrow-3x5arrow25
4arrowx4-10arrow6

Can you work out the output from these combined functions?

inputfunction 1function 2output
12arrow-3x4arrow?
12arrowx4-3arrow?
8arrow+20÷7arrow?
7arrowx5-5arrow?
-8arrow+50÷7arrow?
100arrow÷4-5arrow?
28arrow+20÷8arrow?
-10arrowx5+100arrow?
40arrow-50x7arrow?

Look at the first two above. The functions are the same but they are carried out in a different order.

Does this make a difference to the output?

Try carrying out some of the other combined functions in a different order to see how the output is affected.