SOLUTION: 2xsquared+20=13x

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Question 614529: 2xsquared+20=13x
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 2x%5E2%2B-13x%2B20+=+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=%28-13%29%5E2-4%2A2%2A20=9.

Discriminant d=9 is greater than zero. That means that there are two solutions: +x%5B12%5D+=+%28--13%2B-sqrt%28+9+%29%29%2F2%5Ca.

x%5B1%5D+=+%28-%28-13%29%2Bsqrt%28+9+%29%29%2F2%5C2+=+4
x%5B2%5D+=+%28-%28-13%29-sqrt%28+9+%29%29%2F2%5C2+=+2.5

Quadratic expression 2x%5E2%2B-13x%2B20 can be factored:
2x%5E2%2B-13x%2B20+=+2%28x-4%29%2A%28x-2.5%29
Again, the answer is: 4, 2.5. Here's your graph:
graph%28+500%2C+500%2C+-10%2C+10%2C+-20%2C+20%2C+2%2Ax%5E2%2B-13%2Ax%2B20+%29