4x(10x=8)=180

Solution for 4x(10x=8)=180 equation:

4x(10x=8)=180

We move all terms to the left:

4x(10x-(8))=0

We multiply parentheses

40x^2-32x=0

a = 40; b = -32; c = 0;
Δ = b2-4ac
Δ = -322-4·40·0
Δ = 1024
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1024}=32$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-32)-32}{2*40}=\frac{0}{80}
=0
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-32)+32}{2*40}=\frac{64}{80}
=4/5
$