8u^2-9u-3=0

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Solution for 8u^2-9u-3=0 equation:


Simplifying
8u2 + -9u + -3 = 0

Reorder the terms:
-3 + -9u + 8u2 = 0

Solving
-3 + -9u + 8u2 = 0

Solving for variable 'u'.

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

Divide each side by '8'.
-0.375 + -1.125u + u2 = 0

Move the constant term to the right:

Add '0.375' to each side of the equation.
-0.375 + -1.125u + 0.375 + u2 = 0 + 0.375

Reorder the terms:
-0.375 + 0.375 + -1.125u + u2 = 0 + 0.375

Combine like terms: -0.375 + 0.375 = 0.000
0.000 + -1.125u + u2 = 0 + 0.375
-1.125u + u2 = 0 + 0.375

Combine like terms: 0 + 0.375 = 0.375
-1.125u + u2 = 0.375

The u term is -1.125u.  Take half its coefficient (-0.5625).
Square it (0.31640625) and add it to both sides.

Add '0.31640625' to each side of the equation.
-1.125u + 0.31640625 + u2 = 0.375 + 0.31640625

Reorder the terms:
0.31640625 + -1.125u + u2 = 0.375 + 0.31640625

Combine like terms: 0.375 + 0.31640625 = 0.69140625
0.31640625 + -1.125u + u2 = 0.69140625

Factor a perfect square on the left side:
(u + -0.5625)(u + -0.5625) = 0.69140625

Calculate the square root of the right side: 0.831508418

Break this problem into two subproblems by setting 
(u + -0.5625) equal to 0.831508418 and -0.831508418.

Subproblem 1

u + -0.5625 = 0.831508418 Simplifying u + -0.5625 = 0.831508418 Reorder the terms: -0.5625 + u = 0.831508418 Solving -0.5625 + u = 0.831508418 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.5625' to each side of the equation. -0.5625 + 0.5625 + u = 0.831508418 + 0.5625 Combine like terms: -0.5625 + 0.5625 = 0.0000 0.0000 + u = 0.831508418 + 0.5625 u = 0.831508418 + 0.5625 Combine like terms: 0.831508418 + 0.5625 = 1.394008418 u = 1.394008418 Simplifying u = 1.394008418

Subproblem 2

u + -0.5625 = -0.831508418 Simplifying u + -0.5625 = -0.831508418 Reorder the terms: -0.5625 + u = -0.831508418 Solving -0.5625 + u = -0.831508418 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.5625' to each side of the equation. -0.5625 + 0.5625 + u = -0.831508418 + 0.5625 Combine like terms: -0.5625 + 0.5625 = 0.0000 0.0000 + u = -0.831508418 + 0.5625 u = -0.831508418 + 0.5625 Combine like terms: -0.831508418 + 0.5625 = -0.269008418 u = -0.269008418 Simplifying u = -0.269008418

Solution

The solution to the problem is based on the solutions from the subproblems. u = {1.394008418, -0.269008418}

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