SOLUTION: Now I am lost...please help me. Simplify by combining like terms: 63 square root symbol - 2 square root symbol 28 + 5 square root symbol 7

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If I am reading it the right way, it is;
First you need all of them to be like terms so you can add or subtract.
So, since 63 is not a perfect square you need to find the multiples that are.
63: 3, 7, 9, 12; 9 is a perfect square so; , now look at , 28 is not a perfect square so find multiples that are; 2,4,7,14: 4 is or perfect square, so we have; , and finally ,
7 is not a perfect square, but it does not have any multiples that are so we can not do anything to that. Now we have;
-+
find the square roots of the perfect squares;
, 9 is a perfect square = 3, , 4 is a perfect square=2; so now we have;
-+, now you can add and subtract because they are like terms.
3-4+5=4; so the answer:

Hope you understand :)