SOLUTION: When the sum of 7 and twice a positive number is subtracted from the square of the​ number, 0 results. Find the number. The number is ___

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: When the sum of 7 and twice a positive number is subtracted from the square of the​ number, 0 results. Find the number. The number is ___      Log On


   

Question 1066223: When the sum of 7 and twice a positive number is subtracted from the square of the​ number, 0 results. Find the number.
The number is ___
Answer by ikleyn(52776) About Me  (Show Source):
You can put this solution on YOUR website!
.
x%5E2+-+%282x%2B7%29 = 0,

x%5E2+-+2x+-+7 = 0.

Solve for x.