42u^2+32u=9

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Solution for 42u^2+32u=9 equation:


Simplifying
42u2 + 32u = 9

Reorder the terms:
32u + 42u2 = 9

Solving
32u + 42u2 = 9

Solving for variable 'u'.

Reorder the terms:
-9 + 32u + 42u2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + 32u + 42u2 = 0

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

Divide each side by '42'.
-0.2142857143 + 0.7619047619u + u2 = 0

Move the constant term to the right:

Add '0.2142857143' to each side of the equation.
-0.2142857143 + 0.7619047619u + 0.2142857143 + u2 = 0 + 0.2142857143

Reorder the terms:
-0.2142857143 + 0.2142857143 + 0.7619047619u + u2 = 0 + 0.2142857143

Combine like terms: -0.2142857143 + 0.2142857143 = 0.0000000000
0.0000000000 + 0.7619047619u + u2 = 0 + 0.2142857143
0.7619047619u + u2 = 0 + 0.2142857143

Combine like terms: 0 + 0.2142857143 = 0.2142857143
0.7619047619u + u2 = 0.2142857143

The u term is 0.7619047619u.  Take half its coefficient (0.380952381).
Square it (0.1451247166) and add it to both sides.

Add '0.1451247166' to each side of the equation.
0.7619047619u + 0.1451247166 + u2 = 0.2142857143 + 0.1451247166

Reorder the terms:
0.1451247166 + 0.7619047619u + u2 = 0.2142857143 + 0.1451247166

Combine like terms: 0.2142857143 + 0.1451247166 = 0.3594104309
0.1451247166 + 0.7619047619u + u2 = 0.3594104309

Factor a perfect square on the left side:
(u + 0.380952381)(u + 0.380952381) = 0.3594104309

Calculate the square root of the right side: 0.599508491

Break this problem into two subproblems by setting 
(u + 0.380952381) equal to 0.599508491 and -0.599508491.

Subproblem 1

u + 0.380952381 = 0.599508491 Simplifying u + 0.380952381 = 0.599508491 Reorder the terms: 0.380952381 + u = 0.599508491 Solving 0.380952381 + u = 0.599508491 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-0.380952381' to each side of the equation. 0.380952381 + -0.380952381 + u = 0.599508491 + -0.380952381 Combine like terms: 0.380952381 + -0.380952381 = 0.000000000 0.000000000 + u = 0.599508491 + -0.380952381 u = 0.599508491 + -0.380952381 Combine like terms: 0.599508491 + -0.380952381 = 0.21855611 u = 0.21855611 Simplifying u = 0.21855611

Subproblem 2

u + 0.380952381 = -0.599508491 Simplifying u + 0.380952381 = -0.599508491 Reorder the terms: 0.380952381 + u = -0.599508491 Solving 0.380952381 + u = -0.599508491 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-0.380952381' to each side of the equation. 0.380952381 + -0.380952381 + u = -0.599508491 + -0.380952381 Combine like terms: 0.380952381 + -0.380952381 = 0.000000000 0.000000000 + u = -0.599508491 + -0.380952381 u = -0.599508491 + -0.380952381 Combine like terms: -0.599508491 + -0.380952381 = -0.980460872 u = -0.980460872 Simplifying u = -0.980460872

Solution

The solution to the problem is based on the solutions from the subproblems. u = {0.21855611, -0.980460872}

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