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Mathematics, quadratic form, how to solve this problem in the future?
If the formulas under the root sign are opposite to each other, then both formulas under the root sign are equal to 0.

For example: 2-x=x-2=0, then x=2.

Y=- 1。

Then √x-6y=√(2+6)=2√2.

Question 2: (a-√ 2)? +(b+√3)? =0, then a = √ 2 and b =-√ 3.

Then a/(b- 1)=√2/2-√6/2.

Then √(a? +4b? )=√ 14

Question 3: X? - 16= 16-x? =0, then x=-4(x≠4), then y=- 1/4.

Then √xy= 1