Question

How do you ddd: `3a^3+8a-6` and `4a^2-9a+11`?

Answer 1

You must add together terms that have the same kind of variables (such as `a^3`) according to their numerical values (with sign):
for example:
You can add: `5a^3+2a^3=7a^3` the variables are of the same kind `a^3` so you simply add the mumerical values;
You cannot add: `5a^3+3a^2` the variables are different!!!!
You add together, according to their sign, single numbers (without variables).
Have a go!

If you add correctly, you should get `3a^3+4a^2-a+5`.