2u^2+3u-8=0

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Solution for 2u^2+3u-8=0 equation:


Simplifying
2u2 + 3u + -8 = 0

Reorder the terms:
-8 + 3u + 2u2 = 0

Solving
-8 + 3u + 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 + 1.5u + u2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 1.5u + 4 + u2 = 0 + 4

Reorder the terms:
-4 + 4 + 1.5u + u2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 1.5u + u2 = 0 + 4
1.5u + u2 = 0 + 4

Combine like terms: 0 + 4 = 4
1.5u + u2 = 4

The u term is 1.5u.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5u + 0.5625 + u2 = 4 + 0.5625

Reorder the terms:
0.5625 + 1.5u + u2 = 4 + 0.5625

Combine like terms: 4 + 0.5625 = 4.5625
0.5625 + 1.5u + u2 = 4.5625

Factor a perfect square on the left side:
(u + 0.75)(u + 0.75) = 4.5625

Calculate the square root of the right side: 2.136000936

Break this problem into two subproblems by setting 
(u + 0.75) equal to 2.136000936 and -2.136000936.

Subproblem 1

u + 0.75 = 2.136000936 Simplifying u + 0.75 = 2.136000936 Reorder the terms: 0.75 + u = 2.136000936 Solving 0.75 + u = 2.136000936 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + u = 2.136000936 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + u = 2.136000936 + -0.75 u = 2.136000936 + -0.75 Combine like terms: 2.136000936 + -0.75 = 1.386000936 u = 1.386000936 Simplifying u = 1.386000936

Subproblem 2

u + 0.75 = -2.136000936 Simplifying u + 0.75 = -2.136000936 Reorder the terms: 0.75 + u = -2.136000936 Solving 0.75 + u = -2.136000936 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + u = -2.136000936 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + u = -2.136000936 + -0.75 u = -2.136000936 + -0.75 Combine like terms: -2.136000936 + -0.75 = -2.886000936 u = -2.886000936 Simplifying u = -2.886000936

Solution

The solution to the problem is based on the solutions from the subproblems. u = {1.386000936, -2.886000936}

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