u^2+2u=43

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Solution for u^2+2u=43 equation:


Simplifying
u2 + 2u = 43

Reorder the terms:
2u + u2 = 43

Solving
2u + u2 = 43

Solving for variable 'u'.

Reorder the terms:
-43 + 2u + u2 = 43 + -43

Combine like terms: 43 + -43 = 0
-43 + 2u + u2 = 0

Begin completing the square.

Move the constant term to the right:

Add '43' to each side of the equation.
-43 + 2u + 43 + u2 = 0 + 43

Reorder the terms:
-43 + 43 + 2u + u2 = 0 + 43

Combine like terms: -43 + 43 = 0
0 + 2u + u2 = 0 + 43
2u + u2 = 0 + 43

Combine like terms: 0 + 43 = 43
2u + u2 = 43

The u term is 2u.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2u + 1 + u2 = 43 + 1

Reorder the terms:
1 + 2u + u2 = 43 + 1

Combine like terms: 43 + 1 = 44
1 + 2u + u2 = 44

Factor a perfect square on the left side:
(u + 1)(u + 1) = 44

Calculate the square root of the right side: 6.633249581

Break this problem into two subproblems by setting 
(u + 1) equal to 6.633249581 and -6.633249581.

Subproblem 1

u + 1 = 6.633249581 Simplifying u + 1 = 6.633249581 Reorder the terms: 1 + u = 6.633249581 Solving 1 + u = 6.633249581 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + u = 6.633249581 + -1 Combine like terms: 1 + -1 = 0 0 + u = 6.633249581 + -1 u = 6.633249581 + -1 Combine like terms: 6.633249581 + -1 = 5.633249581 u = 5.633249581 Simplifying u = 5.633249581

Subproblem 2

u + 1 = -6.633249581 Simplifying u + 1 = -6.633249581 Reorder the terms: 1 + u = -6.633249581 Solving 1 + u = -6.633249581 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + u = -6.633249581 + -1 Combine like terms: 1 + -1 = 0 0 + u = -6.633249581 + -1 u = -6.633249581 + -1 Combine like terms: -6.633249581 + -1 = -7.633249581 u = -7.633249581 Simplifying u = -7.633249581

Solution

The solution to the problem is based on the solutions from the subproblems. u = {5.633249581, -7.633249581}

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