u^2+28u=11

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Solution for u^2+28u=11 equation:


Simplifying
u2 + 28u = 11

Reorder the terms:
28u + u2 = 11

Solving
28u + u2 = 11

Solving for variable 'u'.

Reorder the terms:
-11 + 28u + u2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + 28u + u2 = 0

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + 28u + 11 + u2 = 0 + 11

Reorder the terms:
-11 + 11 + 28u + u2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 28u + u2 = 0 + 11
28u + u2 = 0 + 11

Combine like terms: 0 + 11 = 11
28u + u2 = 11

The u term is 28u.  Take half its coefficient (14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
28u + 196 + u2 = 11 + 196

Reorder the terms:
196 + 28u + u2 = 11 + 196

Combine like terms: 11 + 196 = 207
196 + 28u + u2 = 207

Factor a perfect square on the left side:
(u + 14)(u + 14) = 207

Calculate the square root of the right side: 14.38749457

Break this problem into two subproblems by setting 
(u + 14) equal to 14.38749457 and -14.38749457.

Subproblem 1

u + 14 = 14.38749457 Simplifying u + 14 = 14.38749457 Reorder the terms: 14 + u = 14.38749457 Solving 14 + u = 14.38749457 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + u = 14.38749457 + -14 Combine like terms: 14 + -14 = 0 0 + u = 14.38749457 + -14 u = 14.38749457 + -14 Combine like terms: 14.38749457 + -14 = 0.38749457 u = 0.38749457 Simplifying u = 0.38749457

Subproblem 2

u + 14 = -14.38749457 Simplifying u + 14 = -14.38749457 Reorder the terms: 14 + u = -14.38749457 Solving 14 + u = -14.38749457 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + u = -14.38749457 + -14 Combine like terms: 14 + -14 = 0 0 + u = -14.38749457 + -14 u = -14.38749457 + -14 Combine like terms: -14.38749457 + -14 = -28.38749457 u = -28.38749457 Simplifying u = -28.38749457

Solution

The solution to the problem is based on the solutions from the subproblems. u = {0.38749457, -28.38749457}

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