5m^2+4m+8=0

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


Simplifying
5m2 + 4m + 8 = 0

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

Solving
8 + 4m + 5m2 = 0

Solving for variable 'm'.

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

Divide each side by '5'.
1.6 + 0.8m + m2 = 0

Move the constant term to the right:

Add '-1.6' to each side of the equation.
1.6 + 0.8m + -1.6 + m2 = 0 + -1.6

Reorder the terms:
1.6 + -1.6 + 0.8m + m2 = 0 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + 0.8m + m2 = 0 + -1.6
0.8m + m2 = 0 + -1.6

Combine like terms: 0 + -1.6 = -1.6
0.8m + m2 = -1.6

The m term is 0.8m.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8m + 0.16 + m2 = -1.6 + 0.16

Reorder the terms:
0.16 + 0.8m + m2 = -1.6 + 0.16

Combine like terms: -1.6 + 0.16 = -1.44
0.16 + 0.8m + m2 = -1.44

Factor a perfect square on the left side:
(m + 0.4)(m + 0.4) = -1.44

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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