SOLUTION: Can anyone simplify this? [4y-[5z+1)][4y+(5z+1)] thanks!

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Question 714966: Can anyone simplify this?
[4y-[5z+1)][4y+(5z+1)]

thanks!
Answer by mananth(16949) About Me  (Show Source):
You can put this solution on YOUR website!
[4y-[5z+1)][4y+(5z+1)]

use the identity (a+b)(a-b)= a^2-b^2
a= 4y
b=(5z+1)
(4y)^2-(5z+1)^2
16y^2-(25z^2+10z+1)
16y^2-25z^2-10z-1