60h*40h=60h

Solution for 60h*40h=60h equation:

60h*40h=60h

We move all terms to the left:

60h*40h-(60h)=0

We add all the numbers together, and all the variables

-60h+60h*40h=0

Wy multiply elements

2400h^2-60h=0

a = 2400; b = -60; c = 0;
Δ = b2-4ac
Δ = -602-4·2400·0
Δ = 3600
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$h_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$h_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{3600}=60$
$h_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-60)-60}{2*2400}=\frac{0}{4800}
=0
$
$h_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-60)+60}{2*2400}=\frac{120}{4800}
=1/40
$