SOLUTION: r squared plus 3r equals 8

Question 316931: r squared plus 3r equals 8
Found 2 solutions by tinbar, JBarnum:
Answer by tinbar(133) (Show Source): You can put this solution on YOUR website!
r^2+3r=8
r^2+3r-8=0
use quadratic formula to solve
Answer by JBarnum(2146) (Show Source): You can put this solution on YOUR website!

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=41 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 1.70156211871642, -4.70156211871642. Here's your graph:

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