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Adding & Subtracting Polynomials

I hope you did this: 

5 - 3 = 2

So, I hope you won't mess up the set-up on this guy:

Subtract 2a^3 + b - 3 from 8a^3 + b + 4

Be careful with the wording!

( 8a^3 + b + 4 ) - ( 2a^3 + b - 3 ) = ( 8a^3 - 2a^3 ) + ( b - b ) + ( 4 + 3 ) = 6a^3 + 7

YOUR TURN:

subtract 3x^2 - 6xy + y^2 from x^2 - 4xy + 5y^2