-4.9x^2+180x+2=0

Solution for -4.9x^2+180x+2=0 equation:

-4.9x^2+180x+2=0

a = -4.9; b = 180; c = +2;
Δ = b2-4ac
Δ = 1802-4·(-4.9)·2
Δ = 32439.2
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{-(180)-\sqrt{32439.2}}{2*-4.9}=\frac{-180-\sqrt{32439.2}}{-9.8}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(180)+\sqrt{32439.2}}{2*-4.9}=\frac{-180+\sqrt{32439.2}}{-9.8}
$