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

A certain number added to its square is equal to 90. What is/are the number(s) that work?
asked 99.6k views
9 votes
A certain number added to its square is equal to 90. What is/are the number(s) that work?

asked
User Andrey Vykhodtsev
by
8.3k points

2 Answers

11 votes
9,-10 the guy above got what I got
answered
User Jprebys
by
8.1k points
11 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

answered
User Gamecreature
by
7.9k points
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