4=25b^2

Solution for 4=25b^2 equation:

Simplifying
4 = 25b2

Solving
4 = 25b2

Solving for variable 'b'.

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

Add '-25b2' to each side of the equation.
4 + -25b2 = 25b2 + -25b2

Combine like terms: 25b2 + -25b2 = 0
4 + -25b2 = 0

Add '-4' to each side of the equation.
4 + -4 + -25b2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -25b2 = 0 + -4
-25b2 = 0 + -4

Combine like terms: 0 + -4 = -4
-25b2 = -4

Divide each side by '-25'.
b2 = 0.16

Simplifying
b2 = 0.16

Take the square root of each side:
b = {-0.4, 0.4}