8u^2+3u-3=0

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


Simplifying
8u2 + 3u + -3 = 0

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

Solving
-3 + 3u + 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 + 0.375u + u2 = 0

Move the constant term to the right:

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

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

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

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

The u term is 0.375u.  Take half its coefficient (0.1875).
Square it (0.03515625) and add it to both sides.

Add '0.03515625' to each side of the equation.
0.375u + 0.03515625 + u2 = 0.375 + 0.03515625

Reorder the terms:
0.03515625 + 0.375u + u2 = 0.375 + 0.03515625

Combine like terms: 0.375 + 0.03515625 = 0.41015625
0.03515625 + 0.375u + u2 = 0.41015625

Factor a perfect square on the left side:
(u + 0.1875)(u + 0.1875) = 0.41015625

Calculate the square root of the right side: 0.640434423

Break this problem into two subproblems by setting 
(u + 0.1875) equal to 0.640434423 and -0.640434423.

Subproblem 1

u + 0.1875 = 0.640434423 Simplifying u + 0.1875 = 0.640434423 Reorder the terms: 0.1875 + u = 0.640434423 Solving 0.1875 + u = 0.640434423 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-0.1875' to each side of the equation. 0.1875 + -0.1875 + u = 0.640434423 + -0.1875 Combine like terms: 0.1875 + -0.1875 = 0.0000 0.0000 + u = 0.640434423 + -0.1875 u = 0.640434423 + -0.1875 Combine like terms: 0.640434423 + -0.1875 = 0.452934423 u = 0.452934423 Simplifying u = 0.452934423

Subproblem 2

u + 0.1875 = -0.640434423 Simplifying u + 0.1875 = -0.640434423 Reorder the terms: 0.1875 + u = -0.640434423 Solving 0.1875 + u = -0.640434423 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-0.1875' to each side of the equation. 0.1875 + -0.1875 + u = -0.640434423 + -0.1875 Combine like terms: 0.1875 + -0.1875 = 0.0000 0.0000 + u = -0.640434423 + -0.1875 u = -0.640434423 + -0.1875 Combine like terms: -0.640434423 + -0.1875 = -0.827934423 u = -0.827934423 Simplifying u = -0.827934423

Solution

The solution to the problem is based on the solutions from the subproblems. u = {0.452934423, -0.827934423}

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