Question 322193
 how can i solve this 
(r-2)^2-(r+2)^2
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You can't solve it, it's not an equation.
It might be simplified some.
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(r-2)^2-(r+2)^2
One way is to expand everything:
{{{(r^2 - 4r + 4) - (r^2 + 4r + 4)}}}
= -8r
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Another way is to factor it as a difference of 2 squares:
= [(r-2) + (r+2)]*[(r-2) - (r+2)]
= 2r * -4
= -8r