SOLUTION: when the sum of 4 and three times a positive number is subtracted from the square of the number, 0 results. Find the number

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Question 745833: when the sum of 4 and three times a positive number is subtracted from the square of the number, 0 results. Find the number
Answer by savvyhush23(50)   (Show Source): You can put this solution on YOUR website!
when the sum of 4 and three times a positive number is subtracted from the square of the number, 0 results. Find the number
let x is the number:
when the sum of 4 and three times a positive number:
is subtracted from the square of the number, 0 results:

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=25 is greater than zero. That means that there are two solutions: .




Quadratic expression can be factored:

Again, the answer is: 4, -1. Here's your graph:


Therefore the positive number is: 4
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