SOLUTION: 3x^2+4x-27=0

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Question 606916: 3x^2+4x-27=0
Answer by asuar010(338) About Me  (Show Source):
You can put this solution on YOUR website!
Solved by pluggable solver: SOLVE quadratic equation with variable
Quadratic equation ax%5E2%2Bbx%2Bc=0 (in our case 3x%5E2%2B4x%2B-27+=+0) has the following solutons:

x%5B12%5D+=+%28b%2B-sqrt%28+b%5E2-4ac+%29%29%2F2%5Ca

For these solutions to exist, the discriminant b%5E2-4ac should not be a negative number.

First, we need to compute the discriminant b%5E2-4ac: b%5E2-4ac=%284%29%5E2-4%2A3%2A-27=340.

Discriminant d=340 is greater than zero. That means that there are two solutions: +x%5B12%5D+=+%28-4%2B-sqrt%28+340+%29%29%2F2%5Ca.

x%5B1%5D+=+%28-%284%29%2Bsqrt%28+340+%29%29%2F2%5C3+=+2.40651481909763
x%5B2%5D+=+%28-%284%29-sqrt%28+340+%29%29%2F2%5C3+=+-3.73984815243096

Quadratic expression 3x%5E2%2B4x%2B-27 can be factored:
3x%5E2%2B4x%2B-27+=+3%28x-2.40651481909763%29%2A%28x--3.73984815243096%29
Again, the answer is: 2.40651481909763, -3.73984815243096. Here's your graph:
graph%28+500%2C+500%2C+-10%2C+10%2C+-20%2C+20%2C+3%2Ax%5E2%2B4%2Ax%2B-27+%29