x^2-7.2x-10.8=0

Solution for x^2-7.2x-10.8=0 equation:

x^2-7.2x-10.8=0

a = 1; b = -7.2; c = -10.8;
Δ = b2-4ac
Δ = -7.22-4·1·(-10.8)
Δ = 95.04
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{-(-7.2)-\sqrt{95.04}}{2*1}=\frac{7.2-\sqrt{95.04}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-7.2)+\sqrt{95.04}}{2*1}=\frac{7.2+\sqrt{95.04}}{2}
$