40-6u=u^2-16

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Solution for 40-6u=u^2-16 equation:


Simplifying
40 + -6u = u2 + -16

Reorder the terms:
40 + -6u = -16 + u2

Solving
40 + -6u = -16 + u2

Solving for variable 'u'.

Reorder the terms:
40 + 16 + -6u + -1u2 = -16 + u2 + 16 + -1u2

Combine like terms: 40 + 16 = 56
56 + -6u + -1u2 = -16 + u2 + 16 + -1u2

Reorder the terms:
56 + -6u + -1u2 = -16 + 16 + u2 + -1u2

Combine like terms: -16 + 16 = 0
56 + -6u + -1u2 = 0 + u2 + -1u2
56 + -6u + -1u2 = u2 + -1u2

Combine like terms: u2 + -1u2 = 0
56 + -6u + -1u2 = 0

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

Divide each side by '-1'.
-56 + 6u + u2 = 0

Move the constant term to the right:

Add '56' to each side of the equation.
-56 + 6u + 56 + u2 = 0 + 56

Reorder the terms:
-56 + 56 + 6u + u2 = 0 + 56

Combine like terms: -56 + 56 = 0
0 + 6u + u2 = 0 + 56
6u + u2 = 0 + 56

Combine like terms: 0 + 56 = 56
6u + u2 = 56

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 = 56 + 9

Reorder the terms:
9 + 6u + u2 = 56 + 9

Combine like terms: 56 + 9 = 65
9 + 6u + u2 = 65

Factor a perfect square on the left side:
(u + 3)(u + 3) = 65

Calculate the square root of the right side: 8.062257748

Break this problem into two subproblems by setting 
(u + 3) equal to 8.062257748 and -8.062257748.

Subproblem 1

u + 3 = 8.062257748 Simplifying u + 3 = 8.062257748 Reorder the terms: 3 + u = 8.062257748 Solving 3 + u = 8.062257748 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 = 8.062257748 + -3 Combine like terms: 3 + -3 = 0 0 + u = 8.062257748 + -3 u = 8.062257748 + -3 Combine like terms: 8.062257748 + -3 = 5.062257748 u = 5.062257748 Simplifying u = 5.062257748

Subproblem 2

u + 3 = -8.062257748 Simplifying u + 3 = -8.062257748 Reorder the terms: 3 + u = -8.062257748 Solving 3 + u = -8.062257748 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 = -8.062257748 + -3 Combine like terms: 3 + -3 = 0 0 + u = -8.062257748 + -3 u = -8.062257748 + -3 Combine like terms: -8.062257748 + -3 = -11.062257748 u = -11.062257748 Simplifying u = -11.062257748

Solution

The solution to the problem is based on the solutions from the subproblems. u = {5.062257748, -11.062257748}

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