u^2+4u-7=0

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Solution for u^2+4u-7=0 equation: 


Simplifying
u2 + 4u + -7 = 0

Reorder the terms:
-7 + 4u + u2 = 0

Solving
-7 + 4u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 4u + 7 + u2 = 0 + 7

Reorder the terms:
-7 + 7 + 4u + u2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 4u + u2 = 0 + 7
4u + u2 = 0 + 7

Combine like terms: 0 + 7 = 7
4u + u2 = 7

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 = 7 + 4

Reorder the terms:
4 + 4u + u2 = 7 + 4

Combine like terms: 7 + 4 = 11
4 + 4u + u2 = 11

Factor a perfect square on the left side:
(u + 2)(u + 2) = 11

Calculate the square root of the right side: 3.31662479

Break this problem into two subproblems by setting 
(u + 2) equal to 3.31662479 and -3.31662479.


Subproblem 1
u + 2 = 3.31662479

Simplifying
u + 2 = 3.31662479

Reorder the terms:
2 + u = 3.31662479

Solving
2 + u = 3.31662479

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 = 3.31662479 + -2

Combine like terms: 2 + -2 = 0
0 + u = 3.31662479 + -2
u = 3.31662479 + -2

Combine like terms: 3.31662479 + -2 = 1.31662479
u = 1.31662479

Simplifying
u = 1.31662479


Subproblem 2
u + 2 = -3.31662479

Simplifying
u + 2 = -3.31662479

Reorder the terms:
2 + u = -3.31662479

Solving
2 + u = -3.31662479

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 = -3.31662479 + -2

Combine like terms: 2 + -2 = 0
0 + u = -3.31662479 + -2
u = -3.31662479 + -2

Combine like terms: -3.31662479 + -2 = -5.31662479
u = -5.31662479

Simplifying
u = -5.31662479


Solution
The solution to the problem is based on the solutions
from the subproblems.
u = {1.31662479, -5.31662479}

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