23u^2-6u-7=0

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Solution for 23u^2-6u-7=0 equation:


Simplifying
23u2 + -6u + -7 = 0

Reorder the terms:
-7 + -6u + 23u2 = 0

Solving
-7 + -6u + 23u2 = 0

Solving for variable 'u'.

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

Divide each side by '23'.
-0.3043478261 + -0.2608695652u + u2 = 0

Move the constant term to the right:

Add '0.3043478261' to each side of the equation.
-0.3043478261 + -0.2608695652u + 0.3043478261 + u2 = 0 + 0.3043478261

Reorder the terms:
-0.3043478261 + 0.3043478261 + -0.2608695652u + u2 = 0 + 0.3043478261

Combine like terms: -0.3043478261 + 0.3043478261 = 0.0000000000
0.0000000000 + -0.2608695652u + u2 = 0 + 0.3043478261
-0.2608695652u + u2 = 0 + 0.3043478261

Combine like terms: 0 + 0.3043478261 = 0.3043478261
-0.2608695652u + u2 = 0.3043478261

The u term is -0.2608695652u.  Take half its coefficient (-0.1304347826).
Square it (0.01701323251) and add it to both sides.

Add '0.01701323251' to each side of the equation.
-0.2608695652u + 0.01701323251 + u2 = 0.3043478261 + 0.01701323251

Reorder the terms:
0.01701323251 + -0.2608695652u + u2 = 0.3043478261 + 0.01701323251

Combine like terms: 0.3043478261 + 0.01701323251 = 0.32136105861
0.01701323251 + -0.2608695652u + u2 = 0.32136105861

Factor a perfect square on the left side:
(u + -0.1304347826)(u + -0.1304347826) = 0.32136105861

Calculate the square root of the right side: 0.566887166

Break this problem into two subproblems by setting 
(u + -0.1304347826) equal to 0.566887166 and -0.566887166.

Subproblem 1

u + -0.1304347826 = 0.566887166 Simplifying u + -0.1304347826 = 0.566887166 Reorder the terms: -0.1304347826 + u = 0.566887166 Solving -0.1304347826 + u = 0.566887166 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.1304347826' to each side of the equation. -0.1304347826 + 0.1304347826 + u = 0.566887166 + 0.1304347826 Combine like terms: -0.1304347826 + 0.1304347826 = 0.0000000000 0.0000000000 + u = 0.566887166 + 0.1304347826 u = 0.566887166 + 0.1304347826 Combine like terms: 0.566887166 + 0.1304347826 = 0.6973219486 u = 0.6973219486 Simplifying u = 0.6973219486

Subproblem 2

u + -0.1304347826 = -0.566887166 Simplifying u + -0.1304347826 = -0.566887166 Reorder the terms: -0.1304347826 + u = -0.566887166 Solving -0.1304347826 + u = -0.566887166 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.1304347826' to each side of the equation. -0.1304347826 + 0.1304347826 + u = -0.566887166 + 0.1304347826 Combine like terms: -0.1304347826 + 0.1304347826 = 0.0000000000 0.0000000000 + u = -0.566887166 + 0.1304347826 u = -0.566887166 + 0.1304347826 Combine like terms: -0.566887166 + 0.1304347826 = -0.4364523834 u = -0.4364523834 Simplifying u = -0.4364523834

Solution

The solution to the problem is based on the solutions from the subproblems. u = {0.6973219486, -0.4364523834}

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