SOLUTION: ADD (9/z-4 )+ (9/z+4)

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Question 197563: ADD
(9/z-4 )+ (9/z+4)
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
9%2F%28z-4%29%2B+9%2F%28z%2B4%29
Since you are trying to add fractions, you must have the same denominator.
A "common denominator" is (z-4)(z+4)
9%2F%28z-4%29%2B+9%2F%28z%2B4%29


%28%289z%2B36%2B9z-36%29%2F%28%28z-4%29%28z%2B4%29%29%29+
%28%2818z%29%2F%28%28z-4%29%28z%2B4%29%29%29+
%28%2818z%29%2F%28z%5E2-16%29%29+