(9x^2-4x-56)+(9x^2+9x)=

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Solution for (9x^2-4x-56)+(9x^2+9x)= equation:


Simplifying
(9x2 + -4x + -56) + (9x2 + 9x) = 0

Reorder the terms:
(-56 + -4x + 9x2) + (9x2 + 9x) = 0

Remove parenthesis around (-56 + -4x + 9x2)
-56 + -4x + 9x2 + (9x2 + 9x) = 0

Reorder the terms:
-56 + -4x + 9x2 + (9x + 9x2) = 0

Remove parenthesis around (9x + 9x2)
-56 + -4x + 9x2 + 9x + 9x2 = 0

Reorder the terms:
-56 + -4x + 9x + 9x2 + 9x2 = 0

Combine like terms: -4x + 9x = 5x
-56 + 5x + 9x2 + 9x2 = 0

Combine like terms: 9x2 + 9x2 = 18x2
-56 + 5x + 18x2 = 0

Solving
-56 + 5x + 18x2 = 0

Solving for variable 'x'.

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

Divide each side by '18'.
-3.111111111 + 0.2777777778x + x2 = 0

Move the constant term to the right:

Add '3.111111111' to each side of the equation.
-3.111111111 + 0.2777777778x + 3.111111111 + x2 = 0 + 3.111111111

Reorder the terms:
-3.111111111 + 3.111111111 + 0.2777777778x + x2 = 0 + 3.111111111

Combine like terms: -3.111111111 + 3.111111111 = 0.000000000
0.000000000 + 0.2777777778x + x2 = 0 + 3.111111111
0.2777777778x + x2 = 0 + 3.111111111

Combine like terms: 0 + 3.111111111 = 3.111111111
0.2777777778x + x2 = 3.111111111

The x term is 0.2777777778x.  Take half its coefficient (0.1388888889).
Square it (0.01929012346) and add it to both sides.

Add '0.01929012346' to each side of the equation.
0.2777777778x + 0.01929012346 + x2 = 3.111111111 + 0.01929012346

Reorder the terms:
0.01929012346 + 0.2777777778x + x2 = 3.111111111 + 0.01929012346

Combine like terms: 3.111111111 + 0.01929012346 = 3.13040123446
0.01929012346 + 0.2777777778x + x2 = 3.13040123446

Factor a perfect square on the left side:
(x + 0.1388888889)(x + 0.1388888889) = 3.13040123446

Calculate the square root of the right side: 1.769293993

Break this problem into two subproblems by setting 
(x + 0.1388888889) equal to 1.769293993 and -1.769293993.

Subproblem 1

x + 0.1388888889 = 1.769293993 Simplifying x + 0.1388888889 = 1.769293993 Reorder the terms: 0.1388888889 + x = 1.769293993 Solving 0.1388888889 + x = 1.769293993 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1388888889' to each side of the equation. 0.1388888889 + -0.1388888889 + x = 1.769293993 + -0.1388888889 Combine like terms: 0.1388888889 + -0.1388888889 = 0.0000000000 0.0000000000 + x = 1.769293993 + -0.1388888889 x = 1.769293993 + -0.1388888889 Combine like terms: 1.769293993 + -0.1388888889 = 1.6304051041 x = 1.6304051041 Simplifying x = 1.6304051041

Subproblem 2

x + 0.1388888889 = -1.769293993 Simplifying x + 0.1388888889 = -1.769293993 Reorder the terms: 0.1388888889 + x = -1.769293993 Solving 0.1388888889 + x = -1.769293993 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1388888889' to each side of the equation. 0.1388888889 + -0.1388888889 + x = -1.769293993 + -0.1388888889 Combine like terms: 0.1388888889 + -0.1388888889 = 0.0000000000 0.0000000000 + x = -1.769293993 + -0.1388888889 x = -1.769293993 + -0.1388888889 Combine like terms: -1.769293993 + -0.1388888889 = -1.9081828819 x = -1.9081828819 Simplifying x = -1.9081828819

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.6304051041, -1.9081828819}

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