u^2-12u=54

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Solution for u^2-12u=54 equation:


Simplifying
u2 + -12u = 54

Reorder the terms:
-12u + u2 = 54

Solving
-12u + u2 = 54

Solving for variable 'u'.

Reorder the terms:
-54 + -12u + u2 = 54 + -54

Combine like terms: 54 + -54 = 0
-54 + -12u + u2 = 0

Begin completing the square.

Move the constant term to the right:

Add '54' to each side of the equation.
-54 + -12u + 54 + u2 = 0 + 54

Reorder the terms:
-54 + 54 + -12u + u2 = 0 + 54

Combine like terms: -54 + 54 = 0
0 + -12u + u2 = 0 + 54
-12u + u2 = 0 + 54

Combine like terms: 0 + 54 = 54
-12u + u2 = 54

The u term is -12u.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12u + 36 + u2 = 54 + 36

Reorder the terms:
36 + -12u + u2 = 54 + 36

Combine like terms: 54 + 36 = 90
36 + -12u + u2 = 90

Factor a perfect square on the left side:
(u + -6)(u + -6) = 90

Calculate the square root of the right side: 9.486832981

Break this problem into two subproblems by setting 
(u + -6) equal to 9.486832981 and -9.486832981.

Subproblem 1

u + -6 = 9.486832981 Simplifying u + -6 = 9.486832981 Reorder the terms: -6 + u = 9.486832981 Solving -6 + u = 9.486832981 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + u = 9.486832981 + 6 Combine like terms: -6 + 6 = 0 0 + u = 9.486832981 + 6 u = 9.486832981 + 6 Combine like terms: 9.486832981 + 6 = 15.486832981 u = 15.486832981 Simplifying u = 15.486832981

Subproblem 2

u + -6 = -9.486832981 Simplifying u + -6 = -9.486832981 Reorder the terms: -6 + u = -9.486832981 Solving -6 + u = -9.486832981 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + u = -9.486832981 + 6 Combine like terms: -6 + 6 = 0 0 + u = -9.486832981 + 6 u = -9.486832981 + 6 Combine like terms: -9.486832981 + 6 = -3.486832981 u = -3.486832981 Simplifying u = -3.486832981

Solution

The solution to the problem is based on the solutions from the subproblems. u = {15.486832981, -3.486832981}

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