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Find the number which wohen added to its square, makes 90..
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3 votes
Find the number which wohen added
to its square, makes 90..

User Adam Williams
by
8.1k points

1 Answer

5 votes

Answer: -10 or 9

Explanation:

Let the number be x. Then,


x^2 +x=90\\\\x^2 +x-90=0\\\\(x+10)(x-9)=0\\\\x=-10, 9

User Hlex
by
8.2k points
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