8a^2+4a=-5

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Solution for 8a^2+4a=-5 equation:


Simplifying
8a2 + 4a = -5

Reorder the terms:
4a + 8a2 = -5

Solving
4a + 8a2 = -5

Solving for variable 'a'.

Reorder the terms:
5 + 4a + 8a2 = -5 + 5

Combine like terms: -5 + 5 = 0
5 + 4a + 8a2 = 0

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

Divide each side by '8'.
0.625 + 0.5a + a2 = 0

Move the constant term to the right:

Add '-0.625' to each side of the equation.
0.625 + 0.5a + -0.625 + a2 = 0 + -0.625

Reorder the terms:
0.625 + -0.625 + 0.5a + a2 = 0 + -0.625

Combine like terms: 0.625 + -0.625 = 0.000
0.000 + 0.5a + a2 = 0 + -0.625
0.5a + a2 = 0 + -0.625

Combine like terms: 0 + -0.625 = -0.625
0.5a + a2 = -0.625

The a term is 0.5a.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5a + 0.0625 + a2 = -0.625 + 0.0625

Reorder the terms:
0.0625 + 0.5a + a2 = -0.625 + 0.0625

Combine like terms: -0.625 + 0.0625 = -0.5625
0.0625 + 0.5a + a2 = -0.5625

Factor a perfect square on the left side:
(a + 0.25)(a + 0.25) = -0.5625

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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