SOLUTION: when 11 times a certain integer is subtracted from twice the square of the integer, the result is 21 what is the integer
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Question 1175047: when 11 times a certain integer is subtracted from twice the square of the integer, the result is 21 what is the integer Answer by ikleyn(52781) (Show Source):
Let x be the number.
Then from the condition, you have this equation
2x^2 - 11x = 21.
Solve this quadratic equation using the quadratic formula.
ANSWER. There are two solutions x= 7 and x= .
