I can't understand this algebra!I have tried and tried can some one please explain?

Question:Here's some of the problems
8xy-16xy (the xy is to the 4th power)
14( y3rd power) +25 (y5th power)

Answers:
Here is the actual problem with explanations.
Oh my god, they teach that at schools!?!

When are you ever going to use that? lol...use this website it may help to explain it



http://www.pitt.edu/~poole/secedmathalge...

good luck
8xy 4th power-16xy 4th power= -8
xy cancels out 8 from -16 =-8.
14y 3rd power+ 25y 5th power=39y 8th power
-8
39y^8

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