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Since squaring n makes the product positive, –8, –9, and –10 also satisfy the requirement.

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Don't be so lazy.

in these problems just take the square root of both sides. Remember it can be both positive and negative.

It is very simple

The answer to the problem is 6. There are 6 numbers, 8, 9, 10, -8, -9, and -10 that satisfy this requirement of this problem.

~~Hypotenuisance