75=0.03v2

Solution for 75=0.03v2 equation:

75=0.03v^2

We move all terms to the left:

75-(0.03v^2)=0

We get rid of parentheses

-0.03v^2+75=0

a = -0.03; b = 0; c = +75;
Δ = b2-4ac
Δ = 02-4·(-0.03)·75
Δ = 9
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$v_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$v_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{9}=3$
$v_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-3}{2*-0.03}=\frac{-3}{-0.06}
=+50
$
$v_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+3}{2*-0.03}=\frac{3}{-0.06}
=-50
$