1*3x*5x=72

Solution for 1*3x*5x=72 equation:

1*3x*5x=72

We move all terms to the left:

1*3x*5x-(72)=0

Wy multiply elements

15x^2*5-72=0

Wy multiply elements

75x^2-72=0

a = 75; b = 0; c = -72;
Δ = b2-4ac
Δ = 02-4·75·(-72)
Δ = 21600
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:

$\sqrt{\Delta}=\sqrt{21600}=\sqrt{3600*6}=\sqrt{3600}*\sqrt{6}=60\sqrt{6}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-60\sqrt{6}}{2*75}=\frac{0-60\sqrt{6}}{150}
=-\frac{60\sqrt{6}}{150}
=-\frac{2\sqrt{6}}{5}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+60\sqrt{6}}{2*75}=\frac{0+60\sqrt{6}}{150}
=\frac{60\sqrt{6}}{150}
=\frac{2\sqrt{6}}{5}
$