(2x+45)x=180

Solution for (2x+45)x=180 equation:

(2x+45)x=180

We move all terms to the left:

(2x+45)x-(180)=0

We multiply parentheses

2x^2+45x-180=0

a = 2; b = 45; c = -180;
Δ = b2-4ac
Δ = 452-4·2·(-180)
Δ = 3465
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{3465}=\sqrt{9*385}=\sqrt{9}*\sqrt{385}=3\sqrt{385}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(45)-3\sqrt{385}}{2*2}=\frac{-45-3\sqrt{385}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(45)+3\sqrt{385}}{2*2}=\frac{-45+3\sqrt{385}}{4}
$