5u^2+8u=-2

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Solution for 5u^2+8u=-2 equation:


Simplifying
5u2 + 8u = -2

Reorder the terms:
8u + 5u2 = -2

Solving
8u + 5u2 = -2

Solving for variable 'u'.

Reorder the terms:
2 + 8u + 5u2 = -2 + 2

Combine like terms: -2 + 2 = 0
2 + 8u + 5u2 = 0

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

Divide each side by '5'.
0.4 + 1.6u + u2 = 0

Move the constant term to the right:

Add '-0.4' to each side of the equation.
0.4 + 1.6u + -0.4 + u2 = 0 + -0.4

Reorder the terms:
0.4 + -0.4 + 1.6u + u2 = 0 + -0.4

Combine like terms: 0.4 + -0.4 = 0.0
0.0 + 1.6u + u2 = 0 + -0.4
1.6u + u2 = 0 + -0.4

Combine like terms: 0 + -0.4 = -0.4
1.6u + u2 = -0.4

The u term is 1.6u.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6u + 0.64 + u2 = -0.4 + 0.64

Reorder the terms:
0.64 + 1.6u + u2 = -0.4 + 0.64

Combine like terms: -0.4 + 0.64 = 0.24
0.64 + 1.6u + u2 = 0.24

Factor a perfect square on the left side:
(u + 0.8)(u + 0.8) = 0.24

Calculate the square root of the right side: 0.489897949

Break this problem into two subproblems by setting 
(u + 0.8) equal to 0.489897949 and -0.489897949.

Subproblem 1

u + 0.8 = 0.489897949 Simplifying u + 0.8 = 0.489897949 Reorder the terms: 0.8 + u = 0.489897949 Solving 0.8 + u = 0.489897949 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + u = 0.489897949 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + u = 0.489897949 + -0.8 u = 0.489897949 + -0.8 Combine like terms: 0.489897949 + -0.8 = -0.310102051 u = -0.310102051 Simplifying u = -0.310102051

Subproblem 2

u + 0.8 = -0.489897949 Simplifying u + 0.8 = -0.489897949 Reorder the terms: 0.8 + u = -0.489897949 Solving 0.8 + u = -0.489897949 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + u = -0.489897949 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + u = -0.489897949 + -0.8 u = -0.489897949 + -0.8 Combine like terms: -0.489897949 + -0.8 = -1.289897949 u = -1.289897949 Simplifying u = -1.289897949

Solution

The solution to the problem is based on the solutions from the subproblems. u = {-0.310102051, -1.289897949}

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