5u=u^2-4

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


Simplifying
5u = u2 + -4

Reorder the terms:
5u = -4 + u2

Solving
5u = -4 + u2

Solving for variable 'u'.

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

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

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

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

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-4 + -5u + u2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -5u + 4 + u2 = 0 + 4

Reorder the terms:
-4 + 4 + -5u + u2 = 0 + 4

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

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

The u term is -5u.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5u + 6.25 + u2 = 4 + 6.25

Reorder the terms:
6.25 + -5u + u2 = 4 + 6.25

Combine like terms: 4 + 6.25 = 10.25
6.25 + -5u + u2 = 10.25

Factor a perfect square on the left side:
(u + -2.5)(u + -2.5) = 10.25

Calculate the square root of the right side: 3.201562119

Break this problem into two subproblems by setting 
(u + -2.5) equal to 3.201562119 and -3.201562119.

Subproblem 1

u + -2.5 = 3.201562119 Simplifying u + -2.5 = 3.201562119 Reorder the terms: -2.5 + u = 3.201562119 Solving -2.5 + u = 3.201562119 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + u = 3.201562119 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + u = 3.201562119 + 2.5 u = 3.201562119 + 2.5 Combine like terms: 3.201562119 + 2.5 = 5.701562119 u = 5.701562119 Simplifying u = 5.701562119

Subproblem 2

u + -2.5 = -3.201562119 Simplifying u + -2.5 = -3.201562119 Reorder the terms: -2.5 + u = -3.201562119 Solving -2.5 + u = -3.201562119 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + u = -3.201562119 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + u = -3.201562119 + 2.5 u = -3.201562119 + 2.5 Combine like terms: -3.201562119 + 2.5 = -0.701562119 u = -0.701562119 Simplifying u = -0.701562119

Solution

The solution to the problem is based on the solutions from the subproblems. u = {5.701562119, -0.701562119}

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