SOLUTION: this is on factoring binomials.. i need some one to please answer these with showing work. please help me this is due tonight.. there is only 5 questions. thank you for helping me

Question 205677: this is on factoring binomials.. i need some one to please answer these with showing work. please help me this is due tonight.. there is only 5 questions. thank you for helping me ..
1).
81^2-y^2
3).
100x^2y^2-121
5).
49x^2z^2-100y^2
7).
8x^#+125
9).
64x^3+1
thanks again.. these are on factoring binomials. and if you could and have the time. please explain this to me (factoring binomials)the easiest way to do these.. thanks..

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
1).
81^2-y^2
= (9-y)(9+y)
----------------------
3).
100x^2y^2-121
= (10xy-11)(10xy+11)
-------------------------------
5).
49x^2z^2-100y^2
= (7xz-10y)(7xz+10y)
-----------------------------
7).
8x^#+125
= ?
---------------------
9).
64x^3+1
= (4x^3)+1
= (4x+1)((4x)^2 - 4x + 1)
= (4x+1)(16x^2 - 4x + 1)
-----------------------------
Cheers,
Stan H.
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