u^2-8u+28=41

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Solution for u^2-8u+28=41 equation:


Simplifying
u2 + -8u + 28 = 41

Reorder the terms:
28 + -8u + u2 = 41

Solving
28 + -8u + u2 = 41

Solving for variable 'u'.

Reorder the terms:
28 + -41 + -8u + u2 = 41 + -41

Combine like terms: 28 + -41 = -13
-13 + -8u + u2 = 41 + -41

Combine like terms: 41 + -41 = 0
-13 + -8u + u2 = 0

Begin completing the square.

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + -8u + 13 + u2 = 0 + 13

Reorder the terms:
-13 + 13 + -8u + u2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + -8u + u2 = 0 + 13
-8u + u2 = 0 + 13

Combine like terms: 0 + 13 = 13
-8u + u2 = 13

The u term is -8u.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8u + 16 + u2 = 13 + 16

Reorder the terms:
16 + -8u + u2 = 13 + 16

Combine like terms: 13 + 16 = 29
16 + -8u + u2 = 29

Factor a perfect square on the left side:
(u + -4)(u + -4) = 29

Calculate the square root of the right side: 5.385164807

Break this problem into two subproblems by setting 
(u + -4) equal to 5.385164807 and -5.385164807.

Subproblem 1

u + -4 = 5.385164807 Simplifying u + -4 = 5.385164807 Reorder the terms: -4 + u = 5.385164807 Solving -4 + u = 5.385164807 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + u = 5.385164807 + 4 Combine like terms: -4 + 4 = 0 0 + u = 5.385164807 + 4 u = 5.385164807 + 4 Combine like terms: 5.385164807 + 4 = 9.385164807 u = 9.385164807 Simplifying u = 9.385164807

Subproblem 2

u + -4 = -5.385164807 Simplifying u + -4 = -5.385164807 Reorder the terms: -4 + u = -5.385164807 Solving -4 + u = -5.385164807 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + u = -5.385164807 + 4 Combine like terms: -4 + 4 = 0 0 + u = -5.385164807 + 4 u = -5.385164807 + 4 Combine like terms: -5.385164807 + 4 = -1.385164807 u = -1.385164807 Simplifying u = -1.385164807

Solution

The solution to the problem is based on the solutions from the subproblems. u = {9.385164807, -1.385164807}

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