(8x^2-4x-60)+(7x^2+6x)=0

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Solution for (8x^2-4x-60)+(7x^2+6x)=0 equation:


Simplifying
(8x2 + -4x + -60) + (7x2 + 6x) = 0

Reorder the terms:
(-60 + -4x + 8x2) + (7x2 + 6x) = 0

Remove parenthesis around (-60 + -4x + 8x2)
-60 + -4x + 8x2 + (7x2 + 6x) = 0

Reorder the terms:
-60 + -4x + 8x2 + (6x + 7x2) = 0

Remove parenthesis around (6x + 7x2)
-60 + -4x + 8x2 + 6x + 7x2 = 0

Reorder the terms:
-60 + -4x + 6x + 8x2 + 7x2 = 0

Combine like terms: -4x + 6x = 2x
-60 + 2x + 8x2 + 7x2 = 0

Combine like terms: 8x2 + 7x2 = 15x2
-60 + 2x + 15x2 = 0

Solving
-60 + 2x + 15x2 = 0

Solving for variable 'x'.

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

Divide each side by '15'.
-4 + 0.1333333333x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 0.1333333333x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + 0.1333333333x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 0.1333333333x + x2 = 0 + 4
0.1333333333x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
0.1333333333x + x2 = 4

The x term is 0.1333333333x.  Take half its coefficient (0.06666666665).
Square it (0.004444444442) and add it to both sides.

Add '0.004444444442' to each side of the equation.
0.1333333333x + 0.004444444442 + x2 = 4 + 0.004444444442

Reorder the terms:
0.004444444442 + 0.1333333333x + x2 = 4 + 0.004444444442

Combine like terms: 4 + 0.004444444442 = 4.004444444442
0.004444444442 + 0.1333333333x + x2 = 4.004444444442

Factor a perfect square on the left side:
(x + 0.06666666665)(x + 0.06666666665) = 4.004444444442

Calculate the square root of the right side: 2.001110803

Break this problem into two subproblems by setting 
(x + 0.06666666665) equal to 2.001110803 and -2.001110803.

Subproblem 1

x + 0.06666666665 = 2.001110803 Simplifying x + 0.06666666665 = 2.001110803 Reorder the terms: 0.06666666665 + x = 2.001110803 Solving 0.06666666665 + x = 2.001110803 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.06666666665' to each side of the equation. 0.06666666665 + -0.06666666665 + x = 2.001110803 + -0.06666666665 Combine like terms: 0.06666666665 + -0.06666666665 = 0.00000000000 0.00000000000 + x = 2.001110803 + -0.06666666665 x = 2.001110803 + -0.06666666665 Combine like terms: 2.001110803 + -0.06666666665 = 1.93444413635 x = 1.93444413635 Simplifying x = 1.93444413635

Subproblem 2

x + 0.06666666665 = -2.001110803 Simplifying x + 0.06666666665 = -2.001110803 Reorder the terms: 0.06666666665 + x = -2.001110803 Solving 0.06666666665 + x = -2.001110803 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.06666666665' to each side of the equation. 0.06666666665 + -0.06666666665 + x = -2.001110803 + -0.06666666665 Combine like terms: 0.06666666665 + -0.06666666665 = 0.00000000000 0.00000000000 + x = -2.001110803 + -0.06666666665 x = -2.001110803 + -0.06666666665 Combine like terms: -2.001110803 + -0.06666666665 = -2.06777746965 x = -2.06777746965 Simplifying x = -2.06777746965

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.93444413635, -2.06777746965}

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