150=0.002x^2

Solution for 150=0.002x^2 equation:

150=0.002x^2

We move all terms to the left:

150-(0.002x^2)=0

We get rid of parentheses

-0.002x^2+150=0

a = -0.002; b = 0; c = +150;
Δ = b2-4ac
Δ = 02-4·(-0.002)·150
Δ = 1.2
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{-(0)-\sqrt{1.2}}{2*-0.002}=\frac{0-\sqrt{1.2}}{-0.004}
=-\frac{\sqrt{}}{-0.004}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{1.2}}{2*-0.002}=\frac{0+\sqrt{1.2}}{-0.004}
=\frac{\sqrt{}}{-0.004}
$