No, it becomes a plus, since minus x minus = plus
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a square minus b square
If you mean 36 minus 25 then the square root of 11 is an irrational number
(a+b)(a-b)
To 3 decimal places, the answer is -3.924
square roots of a negative number are imaginary, where i = square root (-1) sqrt (-2500) = sqrt (2500) i = 50 i