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The sum of a number and its square is 90. Find the number.

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  1. 3 July, 02:19
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    Answer: 9Step-by-step explanationExplanation:Let n be the integer in question. Then we haveWe now have a quadratic equation to solve. We could use the quadratic formula, however we know that n is an integer, so instead let's try to solve by factoring instead.
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