5u^2+4=-1u

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Solution for 5u^2+4=-1u equation:


Simplifying
5u2 + 4 = -1u

Reorder the terms:
4 + 5u2 = -1u

Solving
4 + 5u2 = -1u

Solving for variable 'u'.

Reorder the terms:
4 + u + 5u2 = -1u + u

Combine like terms: -1u + u = 0
4 + u + 5u2 = 0

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

Divide each side by '5'.
0.8 + 0.2u + u2 = 0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + 0.2u + -0.8 + u2 = 0 + -0.8

Reorder the terms:
0.8 + -0.8 + 0.2u + u2 = 0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + 0.2u + u2 = 0 + -0.8
0.2u + u2 = 0 + -0.8

Combine like terms: 0 + -0.8 = -0.8
0.2u + u2 = -0.8

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

Add '0.25' to each side of the equation.
0.2u + 0.25 + u2 = -0.8 + 0.25

Reorder the terms:
0.25 + 0.2u + u2 = -0.8 + 0.25

Combine like terms: -0.8 + 0.25 = -0.55
0.25 + 0.2u + u2 = -0.55

Factor a perfect square on the left side:
(u + 0.5)(u + 0.5) = -0.55

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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