18u^2-3u=4

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Solution for 18u^2-3u=4 equation:


Simplifying
18u2 + -3u = 4

Reorder the terms:
-3u + 18u2 = 4

Solving
-3u + 18u2 = 4

Solving for variable 'u'.

Reorder the terms:
-4 + -3u + 18u2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + -3u + 18u2 = 0

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

Divide each side by '18'.
-0.2222222222 + -0.1666666667u + u2 = 0

Move the constant term to the right:

Add '0.2222222222' to each side of the equation.
-0.2222222222 + -0.1666666667u + 0.2222222222 + u2 = 0 + 0.2222222222

Reorder the terms:
-0.2222222222 + 0.2222222222 + -0.1666666667u + u2 = 0 + 0.2222222222

Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000
0.0000000000 + -0.1666666667u + u2 = 0 + 0.2222222222
-0.1666666667u + u2 = 0 + 0.2222222222

Combine like terms: 0 + 0.2222222222 = 0.2222222222
-0.1666666667u + u2 = 0.2222222222

The u term is -0.1666666667u.  Take half its coefficient (-0.08333333335).
Square it (0.006944444447) and add it to both sides.

Add '0.006944444447' to each side of the equation.
-0.1666666667u + 0.006944444447 + u2 = 0.2222222222 + 0.006944444447

Reorder the terms:
0.006944444447 + -0.1666666667u + u2 = 0.2222222222 + 0.006944444447

Combine like terms: 0.2222222222 + 0.006944444447 = 0.229166666647
0.006944444447 + -0.1666666667u + u2 = 0.229166666647

Factor a perfect square on the left side:
(u + -0.08333333335)(u + -0.08333333335) = 0.229166666647

Calculate the square root of the right side: 0.478713554

Break this problem into two subproblems by setting 
(u + -0.08333333335) equal to 0.478713554 and -0.478713554.

Subproblem 1

u + -0.08333333335 = 0.478713554 Simplifying u + -0.08333333335 = 0.478713554 Reorder the terms: -0.08333333335 + u = 0.478713554 Solving -0.08333333335 + u = 0.478713554 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.08333333335' to each side of the equation. -0.08333333335 + 0.08333333335 + u = 0.478713554 + 0.08333333335 Combine like terms: -0.08333333335 + 0.08333333335 = 0.00000000000 0.00000000000 + u = 0.478713554 + 0.08333333335 u = 0.478713554 + 0.08333333335 Combine like terms: 0.478713554 + 0.08333333335 = 0.56204688735 u = 0.56204688735 Simplifying u = 0.56204688735

Subproblem 2

u + -0.08333333335 = -0.478713554 Simplifying u + -0.08333333335 = -0.478713554 Reorder the terms: -0.08333333335 + u = -0.478713554 Solving -0.08333333335 + u = -0.478713554 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.08333333335' to each side of the equation. -0.08333333335 + 0.08333333335 + u = -0.478713554 + 0.08333333335 Combine like terms: -0.08333333335 + 0.08333333335 = 0.00000000000 0.00000000000 + u = -0.478713554 + 0.08333333335 u = -0.478713554 + 0.08333333335 Combine like terms: -0.478713554 + 0.08333333335 = -0.39538022065 u = -0.39538022065 Simplifying u = -0.39538022065

Solution

The solution to the problem is based on the solutions from the subproblems. u = {0.56204688735, -0.39538022065}

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