Help please!!! I really don’t know how to do this!

Can someone me with my math problems i have a bunch. i will give brainliest and lots of pleeeaaasssee

Written as a simplified polynomial in standard form, what is the result when (2x+8)^2(2x+8) 2 is subtracted from 8x^2-38x 2 −3?

Petes dog weighed 30 pounds it then lost 16% of it's weight how much did pete lose