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There are 2 answers, +sqrt 7 and -sqrt7. Generally, the highest exponent in the expression (in this case 2) is the maximum number of possible answers.

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Q: How many solutions are there to the equation x2-7 equals 0?
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What is a definition for the associative property of multiplication and how you would use it to compute 4 times 25 times 27 mentally?

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