2u^2+25u+8=0

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Solution for 2u^2+25u+8=0 equation:


Simplifying
2u2 + 25u + 8 = 0

Reorder the terms:
8 + 25u + 2u2 = 0

Solving
8 + 25u + 2u2 = 0

Solving for variable 'u'.

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

Divide each side by '2'.
4 + 12.5u + u2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + 12.5u + -4 + u2 = 0 + -4

Reorder the terms:
4 + -4 + 12.5u + u2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 12.5u + u2 = 0 + -4
12.5u + u2 = 0 + -4

Combine like terms: 0 + -4 = -4
12.5u + u2 = -4

The u term is 12.5u.  Take half its coefficient (6.25).
Square it (39.0625) and add it to both sides.

Add '39.0625' to each side of the equation.
12.5u + 39.0625 + u2 = -4 + 39.0625

Reorder the terms:
39.0625 + 12.5u + u2 = -4 + 39.0625

Combine like terms: -4 + 39.0625 = 35.0625
39.0625 + 12.5u + u2 = 35.0625

Factor a perfect square on the left side:
(u + 6.25)(u + 6.25) = 35.0625

Calculate the square root of the right side: 5.921359641

Break this problem into two subproblems by setting 
(u + 6.25) equal to 5.921359641 and -5.921359641.

Subproblem 1

u + 6.25 = 5.921359641 Simplifying u + 6.25 = 5.921359641 Reorder the terms: 6.25 + u = 5.921359641 Solving 6.25 + u = 5.921359641 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-6.25' to each side of the equation. 6.25 + -6.25 + u = 5.921359641 + -6.25 Combine like terms: 6.25 + -6.25 = 0.00 0.00 + u = 5.921359641 + -6.25 u = 5.921359641 + -6.25 Combine like terms: 5.921359641 + -6.25 = -0.328640359 u = -0.328640359 Simplifying u = -0.328640359

Subproblem 2

u + 6.25 = -5.921359641 Simplifying u + 6.25 = -5.921359641 Reorder the terms: 6.25 + u = -5.921359641 Solving 6.25 + u = -5.921359641 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-6.25' to each side of the equation. 6.25 + -6.25 + u = -5.921359641 + -6.25 Combine like terms: 6.25 + -6.25 = 0.00 0.00 + u = -5.921359641 + -6.25 u = -5.921359641 + -6.25 Combine like terms: -5.921359641 + -6.25 = -12.171359641 u = -12.171359641 Simplifying u = -12.171359641

Solution

The solution to the problem is based on the solutions from the subproblems. u = {-0.328640359, -12.171359641}

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