Can you help me subtract and divide?

Question

(3n^3+7n)-(-4n^3-7n+6)

and divide

4y^2+23y-72 /
y+8

Answer 1

Best Answer - Chosen by Asker

Don't subtract, add the opposite instead.
(3n^3 + 7n) + (4n^3 + 7n + (-6))
7n^3 + 14n + (-6)

Use long division to get:
4y - 9

Source(s):

I'm a math teacher.

Asker's Rating:

Asker's Comment:

THANKS!!!

Answer 2

ive really never seen(in the real world)letters in math
WHY DO WE NEED THIS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!…

Source(s):

MY STUPID MATH BOOK!!!!!!!!!!!!!!!!!!!!