5(m+1.8)(m-1.8)=0

Solution for 5(m+1.8)(m-1.8)=0 equation:

Simplifying
5(m + 1.8)(m + -1.8) = 0

Reorder the terms:
5(1.8 + m)(m + -1.8) = 0

Reorder the terms:
5(1.8 + m)(-1.8 + m) = 0

Multiply (1.8 + m) * (-1.8 + m)
5(1.8(-1.8 + m) + m(-1.8 + m)) = 0
5((-1.8 * 1.8 + m * 1.8) + m(-1.8 + m)) = 0
5((-3.24 + 1.8m) + m(-1.8 + m)) = 0
5(-3.24 + 1.8m + (-1.8 * m + m * m)) = 0
5(-3.24 + 1.8m + (-1.8m + m2)) = 0

Combine like terms: 1.8m + -1.8m = 0.0
5(-3.24 + 0.0 + m2) = 0
5(-3.24 + m2) = 0
(-3.24 * 5 + m2 * 5) = 0
(-16.2 + 5m2) = 0

Solving
-16.2 + 5m2 = 0

Solving for variable 'm'.

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

Add '16.2' to each side of the equation.
-16.2 + 16.2 + 5m2 = 0 + 16.2

Combine like terms: -16.2 + 16.2 = 0.0
0.0 + 5m2 = 0 + 16.2
5m2 = 0 + 16.2

Combine like terms: 0 + 16.2 = 16.2
5m2 = 16.2

Divide each side by '5'.
m2 = 3.24

Simplifying
m2 = 3.24

Take the square root of each side:
m = {-1.8, 1.8}