u^2+4u-43=0

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Solution for u^2+4u-43=0 equation:


Simplifying
u2 + 4u + -43 = 0

Reorder the terms:
-43 + 4u + u2 = 0

Solving
-43 + 4u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '43' to each side of the equation.
-43 + 4u + 43 + u2 = 0 + 43

Reorder the terms:
-43 + 43 + 4u + u2 = 0 + 43

Combine like terms: -43 + 43 = 0
0 + 4u + u2 = 0 + 43
4u + u2 = 0 + 43

Combine like terms: 0 + 43 = 43
4u + u2 = 43

The u term is 4u.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4u + 4 + u2 = 43 + 4

Reorder the terms:
4 + 4u + u2 = 43 + 4

Combine like terms: 43 + 4 = 47
4 + 4u + u2 = 47

Factor a perfect square on the left side:
(u + 2)(u + 2) = 47

Calculate the square root of the right side: 6.8556546

Break this problem into two subproblems by setting 
(u + 2) equal to 6.8556546 and -6.8556546.

Subproblem 1

u + 2 = 6.8556546 Simplifying u + 2 = 6.8556546 Reorder the terms: 2 + u = 6.8556546 Solving 2 + u = 6.8556546 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + u = 6.8556546 + -2 Combine like terms: 2 + -2 = 0 0 + u = 6.8556546 + -2 u = 6.8556546 + -2 Combine like terms: 6.8556546 + -2 = 4.8556546 u = 4.8556546 Simplifying u = 4.8556546

Subproblem 2

u + 2 = -6.8556546 Simplifying u + 2 = -6.8556546 Reorder the terms: 2 + u = -6.8556546 Solving 2 + u = -6.8556546 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + u = -6.8556546 + -2 Combine like terms: 2 + -2 = 0 0 + u = -6.8556546 + -2 u = -6.8556546 + -2 Combine like terms: -6.8556546 + -2 = -8.8556546 u = -8.8556546 Simplifying u = -8.8556546

Solution

The solution to the problem is based on the solutions from the subproblems. u = {4.8556546, -8.8556546}

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