SOLUTION: Twice the square of a certain number added to 3times the number makes 90.find the number

SOLUTION: Twice the square of a certain number added to 3times the number makes 90.find the number

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Question 519719: Twice the square of a certain number added to 3times the number makes 90.find the number
Answer by oberobic(2304) (Show Source): You can put this solution on YOUR website!
x = a certain number
.
2x^2 +3x = 90
.
2x^2 +3x -90 = 0
.
factor
.
(2x +15)(x -6) = 0
.
x = -15/2 or 6
.

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