Question

How do you subtract: `16a^2-32a+9` from `12a^2+60a-8`?

Answer 1

You can write:
`(12a^2+60a-8)-(16a^2-32a+9)=` the minus changes all the signs inside the second bracket, so you get:

`12a^2+60a-8-16a^2+32a-9=`

Now you can add together (algebrically, i.e., respecting the signs) similar quantities (such as the ones with `a^2`, for example).
Try by yourself, if you have difficulties check the solution below.
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Solution:
`=-4a^2+92a-17`