SOLUTION: I'm thinking of a number. My number has the property that its square is equal to 270 more than five times the number. Enter all numbers that have this property.

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Question 1209108: I'm thinking of a number. My number has the property that its square is equal to 270 more than five times the number. Enter all numbers that have this property.
Answer by ikleyn(52824)   (Show Source): You can put this solution on YOUR website!
.

Write an equation as you read the problem

    x^2 = 5x + 270.


Reduce it to the standard form quadratic equation and apply the quadratic formula.

On solving quadratic equations using the quadratic formula,  see the lessons
    - Introduction into Quadratic Equations
    - PROOF of quadratic formula by completing the square
in this site.



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