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+/- means that the answer can be either a positive(+) number or a negative(-) number.

e.g.

the sqrt(4) = +/- 2

Because +2 x +2 = 4

&

-2 X -2 = 4

Similarly for any other square root values.

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lenpollock

Lvl 17
2d ago

What else can I help you with?