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+/- 3/10

Restate the question: Solve for x: x2 = 9/100.

The rule to remember is that if x2=a, then x=+/- the square root ("sqrt") of a. +/- means that there are two solutions, a positive one and a negative one. (This is a little hard to explain without paper and pencil)

So in you question, x = +/- sqrt(9/100) = +/-sqrt(9)/sqrt(100) = +/- 3/10.

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12y ago

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