18x^2+4x-10=5x^2+15x

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Solution for 18x^2+4x-10=5x^2+15x equation:


Simplifying
18x2 + 4x + -10 = 5x2 + 15x

Reorder the terms:
-10 + 4x + 18x2 = 5x2 + 15x

Reorder the terms:
-10 + 4x + 18x2 = 15x + 5x2

Solving
-10 + 4x + 18x2 = 15x + 5x2

Solving for variable 'x'.

Reorder the terms:
-10 + 4x + -15x + 18x2 + -5x2 = 15x + 5x2 + -15x + -5x2

Combine like terms: 4x + -15x = -11x
-10 + -11x + 18x2 + -5x2 = 15x + 5x2 + -15x + -5x2

Combine like terms: 18x2 + -5x2 = 13x2
-10 + -11x + 13x2 = 15x + 5x2 + -15x + -5x2

Reorder the terms:
-10 + -11x + 13x2 = 15x + -15x + 5x2 + -5x2

Combine like terms: 15x + -15x = 0
-10 + -11x + 13x2 = 0 + 5x2 + -5x2
-10 + -11x + 13x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
-10 + -11x + 13x2 = 0

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

Divide each side by '13'.
-0.7692307692 + -0.8461538462x + x2 = 0

Move the constant term to the right:

Add '0.7692307692' to each side of the equation.
-0.7692307692 + -0.8461538462x + 0.7692307692 + x2 = 0 + 0.7692307692

Reorder the terms:
-0.7692307692 + 0.7692307692 + -0.8461538462x + x2 = 0 + 0.7692307692

Combine like terms: -0.7692307692 + 0.7692307692 = 0.0000000000
0.0000000000 + -0.8461538462x + x2 = 0 + 0.7692307692
-0.8461538462x + x2 = 0 + 0.7692307692

Combine like terms: 0 + 0.7692307692 = 0.7692307692
-0.8461538462x + x2 = 0.7692307692

The x term is -0.8461538462x.  Take half its coefficient (-0.4230769231).
Square it (0.1789940829) and add it to both sides.

Add '0.1789940829' to each side of the equation.
-0.8461538462x + 0.1789940829 + x2 = 0.7692307692 + 0.1789940829

Reorder the terms:
0.1789940829 + -0.8461538462x + x2 = 0.7692307692 + 0.1789940829

Combine like terms: 0.7692307692 + 0.1789940829 = 0.9482248521
0.1789940829 + -0.8461538462x + x2 = 0.9482248521

Factor a perfect square on the left side:
(x + -0.4230769231)(x + -0.4230769231) = 0.9482248521

Calculate the square root of the right side: 0.973768377

Break this problem into two subproblems by setting 
(x + -0.4230769231) equal to 0.973768377 and -0.973768377.

Subproblem 1

x + -0.4230769231 = 0.973768377 Simplifying x + -0.4230769231 = 0.973768377 Reorder the terms: -0.4230769231 + x = 0.973768377 Solving -0.4230769231 + x = 0.973768377 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4230769231' to each side of the equation. -0.4230769231 + 0.4230769231 + x = 0.973768377 + 0.4230769231 Combine like terms: -0.4230769231 + 0.4230769231 = 0.0000000000 0.0000000000 + x = 0.973768377 + 0.4230769231 x = 0.973768377 + 0.4230769231 Combine like terms: 0.973768377 + 0.4230769231 = 1.3968453001 x = 1.3968453001 Simplifying x = 1.3968453001

Subproblem 2

x + -0.4230769231 = -0.973768377 Simplifying x + -0.4230769231 = -0.973768377 Reorder the terms: -0.4230769231 + x = -0.973768377 Solving -0.4230769231 + x = -0.973768377 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4230769231' to each side of the equation. -0.4230769231 + 0.4230769231 + x = -0.973768377 + 0.4230769231 Combine like terms: -0.4230769231 + 0.4230769231 = 0.0000000000 0.0000000000 + x = -0.973768377 + 0.4230769231 x = -0.973768377 + 0.4230769231 Combine like terms: -0.973768377 + 0.4230769231 = -0.5506914539 x = -0.5506914539 Simplifying x = -0.5506914539

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.3968453001, -0.5506914539}

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