SOLUTION: Please help me understand . The equation is : ( a^-1 + b^-1)^2 . I need to simplify it. The answer is (b^2+2ab+a^2)/a^2*b^2. Can you explain why. Why after using a common deno

Question 121022: Please help me understand .
The equation is : ( a^-1 + b^-1)^2 . I need to simplify it. The answer is (b^2+2ab+a^2)/a^2*b^2.
Can you explain why. Why after using a common denominator , the " 2ab" is out of the fraction?
Thank you . Viktor
Answer by nabla(475) (Show Source): You can put this solution on YOUR website!
I presume you are able to get to this step:
Now, what is the common denominator?
Multiply each term by what it is missing to form the common denominator:
.
As you can see, the numerator becomes , and the denominator is .
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