Please help!!!

so i simplified the expression for the first part which was correct and i got -4. I got that by first finding the square roots and solving inside the parentheses, and later i was solving the parts that were outside. But I got an understanding of what is wanted for the second part. so they want for me to find stuff such as that x cant be 0 or y cant be 0 because then the problem wont work so kind of like that. likw how i did it. i just dont know what the correct one is supposed to be.
 
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somethingwonthing said:
so i simplified the expression for the first part which was correct and i got -4. I got that by first finding the square roots and solving inside the parentheses, and later i was solving the parts that were outside. But I got an understanding of what is wanted for the second part. so they want for me to find stuff such as that x cant be 0 or y cant be 0 because then the problem wont work so kind of like that. likw how i did it. i just dont know what the correct one is supposed to be.
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Instead of talking about mathematical operations, show the mathematical steps you have taken to arrive at the result.

For the second part remember

Division by 0 is not allowed → `x \ne y` & `x \ne 0`..............................edited

and square-roots of negative numbers do not exist in real-number domain → `x \ge 0 ` & `y \ge 0 ` → `x \gt 0 ` & `y \ge 0 ` .............. edited
 
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