4m^2+8m+5=0

Solution for 4m^2+8m+5=0 equation:

Simplifying
4m2 + 8m + 5 = 0

Reorder the terms:
5 + 8m + 4m2 = 0

Solving
5 + 8m + 4m2 = 0

Solving for variable 'm'.

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
1.25 + 2m + m2 = 0

Move the constant term to the right:

Add '-1.25' to each side of the equation.
1.25 + 2m + -1.25 + m2 = 0 + -1.25

Reorder the terms:
1.25 + -1.25 + 2m + m2 = 0 + -1.25

Combine like terms: 1.25 + -1.25 = 0.00
0.00 + 2m + m2 = 0 + -1.25
2m + m2 = 0 + -1.25

Combine like terms: 0 + -1.25 = -1.25
2m + m2 = -1.25

The m term is 2m.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2m + 1 + m2 = -1.25 + 1

Reorder the terms:
1 + 2m + m2 = -1.25 + 1

Combine like terms: -1.25 + 1 = -0.25
1 + 2m + m2 = -0.25

Factor a perfect square on the left side:
(m + 1)(m + 1) = -0.25

Can't calculate square root of the right side.

The solution to this equation could not be determined.