u^2-4u-3=0

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Solution for u^2-4u-3=0 equation:


Simplifying
u2 + -4u + -3 = 0

Reorder the terms:
-3 + -4u + u2 = 0

Solving
-3 + -4u + 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 + -4u + 3 + u2 = 0 + 3

Reorder the terms:
-3 + 3 + -4u + u2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -4u + u2 = 0 + 3
-4u + u2 = 0 + 3

Combine like terms: 0 + 3 = 3
-4u + u2 = 3

The u term is -4u.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4u + 4 + u2 = 3 + 4

Reorder the terms:
4 + -4u + u2 = 3 + 4

Combine like terms: 3 + 4 = 7
4 + -4u + u2 = 7

Factor a perfect square on the left side:
(u + -2)(u + -2) = 7

Calculate the square root of the right side: 2.645751311

Break this problem into two subproblems by setting 
(u + -2) equal to 2.645751311 and -2.645751311.

Subproblem 1

u + -2 = 2.645751311 Simplifying u + -2 = 2.645751311 Reorder the terms: -2 + u = 2.645751311 Solving -2 + u = 2.645751311 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + u = 2.645751311 + 2 Combine like terms: -2 + 2 = 0 0 + u = 2.645751311 + 2 u = 2.645751311 + 2 Combine like terms: 2.645751311 + 2 = 4.645751311 u = 4.645751311 Simplifying u = 4.645751311

Subproblem 2

u + -2 = -2.645751311 Simplifying u + -2 = -2.645751311 Reorder the terms: -2 + u = -2.645751311 Solving -2 + u = -2.645751311 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + u = -2.645751311 + 2 Combine like terms: -2 + 2 = 0 0 + u = -2.645751311 + 2 u = -2.645751311 + 2 Combine like terms: -2.645751311 + 2 = -0.645751311 u = -0.645751311 Simplifying u = -0.645751311

Solution

The solution to the problem is based on the solutions from the subproblems. u = {4.645751311, -0.645751311}

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