u^2+9u-3=0

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Solution for u^2+9u-3=0 equation:


Simplifying
u2 + 9u + -3 = 0

Reorder the terms:
-3 + 9u + u2 = 0

Solving
-3 + 9u + 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 + 9u + 3 + u2 = 0 + 3

Reorder the terms:
-3 + 3 + 9u + u2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 9u + u2 = 0 + 3
9u + u2 = 0 + 3

Combine like terms: 0 + 3 = 3
9u + u2 = 3

The u term is 9u.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9u + 20.25 + u2 = 3 + 20.25

Reorder the terms:
20.25 + 9u + u2 = 3 + 20.25

Combine like terms: 3 + 20.25 = 23.25
20.25 + 9u + u2 = 23.25

Factor a perfect square on the left side:
(u + 4.5)(u + 4.5) = 23.25

Calculate the square root of the right side: 4.82182538

Break this problem into two subproblems by setting 
(u + 4.5) equal to 4.82182538 and -4.82182538.

Subproblem 1

u + 4.5 = 4.82182538 Simplifying u + 4.5 = 4.82182538 Reorder the terms: 4.5 + u = 4.82182538 Solving 4.5 + u = 4.82182538 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + u = 4.82182538 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + u = 4.82182538 + -4.5 u = 4.82182538 + -4.5 Combine like terms: 4.82182538 + -4.5 = 0.32182538 u = 0.32182538 Simplifying u = 0.32182538

Subproblem 2

u + 4.5 = -4.82182538 Simplifying u + 4.5 = -4.82182538 Reorder the terms: 4.5 + u = -4.82182538 Solving 4.5 + u = -4.82182538 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + u = -4.82182538 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + u = -4.82182538 + -4.5 u = -4.82182538 + -4.5 Combine like terms: -4.82182538 + -4.5 = -9.32182538 u = -9.32182538 Simplifying u = -9.32182538

Solution

The solution to the problem is based on the solutions from the subproblems. u = {0.32182538, -9.32182538}

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