c^2-7,2c=3,76

Solution for c^2-7,2c=3,76 equation:

c^2-7.2c=3.76

We move all terms to the left:

c^2-7.2c-(3.76)=0

We add all the numbers together, and all the variables

c^2-7.2c-3.76=0

a = 1; b = -7.2; c = -3.76;
Δ = b2-4ac
Δ = -7.22-4·1·(-3.76)
Δ = 66.88
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-7.2)-\sqrt{66.88}}{2*1}=\frac{7.2-\sqrt{66.88}}{2}
$
$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-7.2)+\sqrt{66.88}}{2*1}=\frac{7.2+\sqrt{66.88}}{2}
$