4 x square root of 10 minus square root of 10 = 3 x square root of 10.
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The square root of -4 is: 2 i
It is imaginary; we denote sqrt of -1 = i square root (-4) = ± 2i
√500 - √80 = √5√100 - √5√16 = 10√5 - 4√5 = 6√5
It depends on whether you take the positive square root of 4 (YES) or the negative square root of 4 (No).
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