4=25a^2

Solution for 4=25a^2 equation:

Simplifying
4 = 25a2

Solving
4 = 25a2

Solving for variable 'a'.

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

Add '-25a2' to each side of the equation.
4 + -25a2 = 25a2 + -25a2

Combine like terms: 25a2 + -25a2 = 0
4 + -25a2 = 0

Add '-4' to each side of the equation.
4 + -4 + -25a2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -25a2 = 0 + -4
-25a2 = 0 + -4

Combine like terms: 0 + -4 = -4
-25a2 = -4

Divide each side by '-25'.
a2 = 0.16

Simplifying
a2 = 0.16

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