9x^2+3x-56=56

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Solution for 9x^2+3x-56=56 equation:


Simplifying
9x2 + 3x + -56 = 56

Reorder the terms:
-56 + 3x + 9x2 = 56

Solving
-56 + 3x + 9x2 = 56

Solving for variable 'x'.

Reorder the terms:
-56 + -56 + 3x + 9x2 = 56 + -56

Combine like terms: -56 + -56 = -112
-112 + 3x + 9x2 = 56 + -56

Combine like terms: 56 + -56 = 0
-112 + 3x + 9x2 = 0

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

Divide each side by '9'.
-12.44444444 + 0.3333333333x + x2 = 0

Move the constant term to the right:

Add '12.44444444' to each side of the equation.
-12.44444444 + 0.3333333333x + 12.44444444 + x2 = 0 + 12.44444444

Reorder the terms:
-12.44444444 + 12.44444444 + 0.3333333333x + x2 = 0 + 12.44444444

Combine like terms: -12.44444444 + 12.44444444 = 0.00000000
0.00000000 + 0.3333333333x + x2 = 0 + 12.44444444
0.3333333333x + x2 = 0 + 12.44444444

Combine like terms: 0 + 12.44444444 = 12.44444444
0.3333333333x + x2 = 12.44444444

The x term is 0.3333333333x.  Take half its coefficient (0.1666666667).
Square it (0.02777777779) and add it to both sides.

Add '0.02777777779' to each side of the equation.
0.3333333333x + 0.02777777779 + x2 = 12.44444444 + 0.02777777779

Reorder the terms:
0.02777777779 + 0.3333333333x + x2 = 12.44444444 + 0.02777777779

Combine like terms: 12.44444444 + 0.02777777779 = 12.47222221779
0.02777777779 + 0.3333333333x + x2 = 12.47222221779

Factor a perfect square on the left side:
(x + 0.1666666667)(x + 0.1666666667) = 12.47222221779

Calculate the square root of the right side: 3.531603349

Break this problem into two subproblems by setting 
(x + 0.1666666667) equal to 3.531603349 and -3.531603349.

Subproblem 1

x + 0.1666666667 = 3.531603349 Simplifying x + 0.1666666667 = 3.531603349 Reorder the terms: 0.1666666667 + x = 3.531603349 Solving 0.1666666667 + x = 3.531603349 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1666666667' to each side of the equation. 0.1666666667 + -0.1666666667 + x = 3.531603349 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + x = 3.531603349 + -0.1666666667 x = 3.531603349 + -0.1666666667 Combine like terms: 3.531603349 + -0.1666666667 = 3.3649366823 x = 3.3649366823 Simplifying x = 3.3649366823

Subproblem 2

x + 0.1666666667 = -3.531603349 Simplifying x + 0.1666666667 = -3.531603349 Reorder the terms: 0.1666666667 + x = -3.531603349 Solving 0.1666666667 + x = -3.531603349 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1666666667' to each side of the equation. 0.1666666667 + -0.1666666667 + x = -3.531603349 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + x = -3.531603349 + -0.1666666667 x = -3.531603349 + -0.1666666667 Combine like terms: -3.531603349 + -0.1666666667 = -3.6982700157 x = -3.6982700157 Simplifying x = -3.6982700157

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.3649366823, -3.6982700157}

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