SOLUTION: The square of a number is 90 more than the number find the number

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Question 992152: The square of a number is 90 more than the number find the number
Answer by ikleyn(52794) About Me  (Show Source):
You can put this solution on YOUR website!
.
x%5E2+-+90 = x

x%5E2+-+x+-+90 = 0

Solve this quadratic equation.

Use the quadratic formula or the Viete's theorem.

The roots are 10 and - 9.

Both roots are the solutions.