3u^2=14u+15

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Solution for 3u^2=14u+15 equation:


Simplifying
3u2 = 14u + 15

Reorder the terms:
3u2 = 15 + 14u

Solving
3u2 = 15 + 14u

Solving for variable 'u'.

Reorder the terms:
-15 + -14u + 3u2 = 15 + 14u + -15 + -14u

Reorder the terms:
-15 + -14u + 3u2 = 15 + -15 + 14u + -14u

Combine like terms: 15 + -15 = 0
-15 + -14u + 3u2 = 0 + 14u + -14u
-15 + -14u + 3u2 = 14u + -14u

Combine like terms: 14u + -14u = 0
-15 + -14u + 3u2 = 0

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

Divide each side by '3'.
-5 + -4.666666667u + u2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -4.666666667u + 5 + u2 = 0 + 5

Reorder the terms:
-5 + 5 + -4.666666667u + u2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -4.666666667u + u2 = 0 + 5
-4.666666667u + u2 = 0 + 5

Combine like terms: 0 + 5 = 5
-4.666666667u + u2 = 5

The u term is -4.666666667u.  Take half its coefficient (-2.333333334).
Square it (5.444444448) and add it to both sides.

Add '5.444444448' to each side of the equation.
-4.666666667u + 5.444444448 + u2 = 5 + 5.444444448

Reorder the terms:
5.444444448 + -4.666666667u + u2 = 5 + 5.444444448

Combine like terms: 5 + 5.444444448 = 10.444444448
5.444444448 + -4.666666667u + u2 = 10.444444448

Factor a perfect square on the left side:
(u + -2.333333334)(u + -2.333333334) = 10.444444448

Calculate the square root of the right side: 3.231786572

Break this problem into two subproblems by setting 
(u + -2.333333334) equal to 3.231786572 and -3.231786572.

Subproblem 1

u + -2.333333334 = 3.231786572 Simplifying u + -2.333333334 = 3.231786572 Reorder the terms: -2.333333334 + u = 3.231786572 Solving -2.333333334 + u = 3.231786572 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2.333333334' to each side of the equation. -2.333333334 + 2.333333334 + u = 3.231786572 + 2.333333334 Combine like terms: -2.333333334 + 2.333333334 = 0.000000000 0.000000000 + u = 3.231786572 + 2.333333334 u = 3.231786572 + 2.333333334 Combine like terms: 3.231786572 + 2.333333334 = 5.565119906 u = 5.565119906 Simplifying u = 5.565119906

Subproblem 2

u + -2.333333334 = -3.231786572 Simplifying u + -2.333333334 = -3.231786572 Reorder the terms: -2.333333334 + u = -3.231786572 Solving -2.333333334 + u = -3.231786572 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2.333333334' to each side of the equation. -2.333333334 + 2.333333334 + u = -3.231786572 + 2.333333334 Combine like terms: -2.333333334 + 2.333333334 = 0.000000000 0.000000000 + u = -3.231786572 + 2.333333334 u = -3.231786572 + 2.333333334 Combine like terms: -3.231786572 + 2.333333334 = -0.898453238 u = -0.898453238 Simplifying u = -0.898453238

Solution

The solution to the problem is based on the solutions from the subproblems. u = {5.565119906, -0.898453238}

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