0=-4u^2-31u-50

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Solution for 0=-4u^2-31u-50 equation:


Simplifying
0 = -4u2 + -31u + -50

Reorder the terms:
0 = -50 + -31u + -4u2

Solving
0 = -50 + -31u + -4u2

Solving for variable 'u'.

Combine like terms: 0 + 50 = 50
50 + 31u + 4u2 = -50 + -31u + -4u2 + 50 + 31u + 4u2

Reorder the terms:
50 + 31u + 4u2 = -50 + 50 + -31u + 31u + -4u2 + 4u2

Combine like terms: -50 + 50 = 0
50 + 31u + 4u2 = 0 + -31u + 31u + -4u2 + 4u2
50 + 31u + 4u2 = -31u + 31u + -4u2 + 4u2

Combine like terms: -31u + 31u = 0
50 + 31u + 4u2 = 0 + -4u2 + 4u2
50 + 31u + 4u2 = -4u2 + 4u2

Combine like terms: -4u2 + 4u2 = 0
50 + 31u + 4u2 = 0

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
12.5 + 7.75u + u2 = 0

Move the constant term to the right:

Add '-12.5' to each side of the equation.
12.5 + 7.75u + -12.5 + u2 = 0 + -12.5

Reorder the terms:
12.5 + -12.5 + 7.75u + u2 = 0 + -12.5

Combine like terms: 12.5 + -12.5 = 0.0
0.0 + 7.75u + u2 = 0 + -12.5
7.75u + u2 = 0 + -12.5

Combine like terms: 0 + -12.5 = -12.5
7.75u + u2 = -12.5

The u term is 7.75u.  Take half its coefficient (3.875).
Square it (15.015625) and add it to both sides.

Add '15.015625' to each side of the equation.
7.75u + 15.015625 + u2 = -12.5 + 15.015625

Reorder the terms:
15.015625 + 7.75u + u2 = -12.5 + 15.015625

Combine like terms: -12.5 + 15.015625 = 2.515625
15.015625 + 7.75u + u2 = 2.515625

Factor a perfect square on the left side:
(u + 3.875)(u + 3.875) = 2.515625

Calculate the square root of the right side: 1.586072193

Break this problem into two subproblems by setting 
(u + 3.875) equal to 1.586072193 and -1.586072193.

Subproblem 1

u + 3.875 = 1.586072193 Simplifying u + 3.875 = 1.586072193 Reorder the terms: 3.875 + u = 1.586072193 Solving 3.875 + u = 1.586072193 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-3.875' to each side of the equation. 3.875 + -3.875 + u = 1.586072193 + -3.875 Combine like terms: 3.875 + -3.875 = 0.000 0.000 + u = 1.586072193 + -3.875 u = 1.586072193 + -3.875 Combine like terms: 1.586072193 + -3.875 = -2.288927807 u = -2.288927807 Simplifying u = -2.288927807

Subproblem 2

u + 3.875 = -1.586072193 Simplifying u + 3.875 = -1.586072193 Reorder the terms: 3.875 + u = -1.586072193 Solving 3.875 + u = -1.586072193 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-3.875' to each side of the equation. 3.875 + -3.875 + u = -1.586072193 + -3.875 Combine like terms: 3.875 + -3.875 = 0.000 0.000 + u = -1.586072193 + -3.875 u = -1.586072193 + -3.875 Combine like terms: -1.586072193 + -3.875 = -5.461072193 u = -5.461072193 Simplifying u = -5.461072193

Solution

The solution to the problem is based on the solutions from the subproblems. u = {-2.288927807, -5.461072193}

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