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A certain number added to its square is equal to 90. What is/are the number(s) that work?
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30 votes
30 votes
A certain number added to its square is equal to 90. What is/are the number(s) that work?

User Nadir Belhaj
by
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2 Answers

17 votes
17 votes
9,-10 the guy above got what I got
User Switz
by
2.9k points
13 votes
13 votes

Answer:

9,-10

Explanation:

Let u be a number.


u + {u}^(2) = 90


u {}^(2) + u - 90 = 0


(u + 10)(u - 9) = 0


u = - 10

or


u = 9

9, -10

User Harish Gadiya
by
2.9k points
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