u^2+6u-3=0

Solution for u^2+6u-3=0 equation:

Simplifying
u2 + 6u + -3 = 0

Reorder the terms:
-3 + 6u + u2 = 0

Solving
-3 + 6u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 6u + 3 + u2 = 0 + 3

Reorder the terms:
-3 + 3 + 6u + u2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 6u + u2 = 0 + 3
6u + u2 = 0 + 3

Combine like terms: 0 + 3 = 3
6u + u2 = 3

The u term is 6u.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6u + 9 + u2 = 3 + 9

Reorder the terms:
9 + 6u + u2 = 3 + 9

Combine like terms: 3 + 9 = 12
9 + 6u + u2 = 12

Factor a perfect square on the left side:
(u + 3)(u + 3) = 12

Calculate the square root of the right side: 3.464101615

Break this problem into two subproblems by setting 
(u + 3) equal to 3.464101615 and -3.464101615.

Subproblem 1
u + 3 = 3.464101615

Simplifying
u + 3 = 3.464101615

Reorder the terms:
3 + u = 3.464101615

Solving
3 + u = 3.464101615

Solving for variable 'u'.

Move all terms containing u to the left, all other terms to the right.

Add '-3' to each side of the equation.
3 + -3 + u = 3.464101615 + -3

Combine like terms: 3 + -3 = 0
0 + u = 3.464101615 + -3
u = 3.464101615 + -3

Combine like terms: 3.464101615 + -3 = 0.464101615
u = 0.464101615

Simplifying
u = 0.464101615

Subproblem 2
u + 3 = -3.464101615

Simplifying
u + 3 = -3.464101615

Reorder the terms:
3 + u = -3.464101615

Solving
3 + u = -3.464101615

Solving for variable 'u'.

Move all terms containing u to the left, all other terms to the right.

Add '-3' to each side of the equation.
3 + -3 + u = -3.464101615 + -3

Combine like terms: 3 + -3 = 0
0 + u = -3.464101615 + -3
u = -3.464101615 + -3

Combine like terms: -3.464101615 + -3 = -6.464101615
u = -6.464101615

Simplifying
u = -6.464101615

Solution
The solution to the problem is based on the solutions
from the subproblems.
u = {0.464101615, -6.464101615}