42=.05v^2

Solution for 42=.05v^2 equation:

Simplifying
42 = 0.05v2

Solving
42 = 0.05v2

Solving for variable 'v'.

Move all terms containing v to the left, all other terms to the right.

Add '-0.05v2' to each side of the equation.
42 + -0.05v2 = 0.05v2 + -0.05v2

Combine like terms: 0.05v2 + -0.05v2 = 0.00
42 + -0.05v2 = 0.00

Add '-42' to each side of the equation.
42 + -42 + -0.05v2 = 0.00 + -42

Combine like terms: 42 + -42 = 0
0 + -0.05v2 = 0.00 + -42
-0.05v2 = 0.00 + -42

Combine like terms: 0.00 + -42 = -42
-0.05v2 = -42

Divide each side by '-0.05'.
v2 = 840

Simplifying
v2 = 840

Take the square root of each side:
v = {-28.982753492, 28.982753492}