x^2+x=7.24

Solution for x^2+x=7.24 equation:

x^2+x=7.24

We move all terms to the left:

x^2+x-(7.24)=0

We add all the numbers together, and all the variables

x^2+x-7.24=0

a = 1; b = 1; c = -7.24;
Δ = b2-4ac
Δ = 12-4·1·(-7.24)
Δ = 29.96
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(1)-\sqrt{29.96}}{2*1}=\frac{-1-\sqrt{29.96}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+\sqrt{29.96}}{2*1}=\frac{-1+\sqrt{29.96}}{2}
$