-8u^2+3u+6=0

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Solution for -8u^2+3u+6=0 equation:


Simplifying
-8u2 + 3u + 6 = 0

Reorder the terms:
6 + 3u + -8u2 = 0

Solving
6 + 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'.
-0.75 + -0.375u + u2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + -0.375u + 0.75 + u2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + -0.375u + u2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + -0.375u + u2 = 0 + 0.75
-0.375u + u2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
-0.375u + u2 = 0.75

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 = 0.75 + 0.03515625

Reorder the terms:
0.03515625 + -0.375u + u2 = 0.75 + 0.03515625

Combine like terms: 0.75 + 0.03515625 = 0.78515625
0.03515625 + -0.375u + u2 = 0.78515625

Factor a perfect square on the left side:
(u + -0.1875)(u + -0.1875) = 0.78515625

Calculate the square root of the right side: 0.88609043

Break this problem into two subproblems by setting 
(u + -0.1875) equal to 0.88609043 and -0.88609043.

Subproblem 1

u + -0.1875 = 0.88609043 Simplifying u + -0.1875 = 0.88609043 Reorder the terms: -0.1875 + u = 0.88609043 Solving -0.1875 + u = 0.88609043 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 = 0.88609043 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + u = 0.88609043 + 0.1875 u = 0.88609043 + 0.1875 Combine like terms: 0.88609043 + 0.1875 = 1.07359043 u = 1.07359043 Simplifying u = 1.07359043

Subproblem 2

u + -0.1875 = -0.88609043 Simplifying u + -0.1875 = -0.88609043 Reorder the terms: -0.1875 + u = -0.88609043 Solving -0.1875 + u = -0.88609043 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 = -0.88609043 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + u = -0.88609043 + 0.1875 u = -0.88609043 + 0.1875 Combine like terms: -0.88609043 + 0.1875 = -0.69859043 u = -0.69859043 Simplifying u = -0.69859043

Solution

The solution to the problem is based on the solutions from the subproblems. u = {1.07359043, -0.69859043}

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