SOLUTION: twice the square of a no. is more than eleven times the number by 21.the number can have which of the following value

Question 882178: twice the square of a no. is more than eleven times the number by 21.the number can have which of the following value
Answer by pj66(7) (Show Source): You can put this solution on YOUR website!
Let the no. be x.
=> 2*x^2=11*x+21
since, twice the square of a no. is more than eleven times the number by 21.

Solved by pluggable solver: SOLVE quadratic equation with variable

Quadratic equation (in our case ) has the following solutons:

For these solutions to exist, the discriminant should not be a negative number.

First, we need to compute the discriminant : .

Discriminant d=289 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 7, -1.5. Here's your graph:

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