9x^2=12+7x

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Solution for 9x^2=12+7x equation:


Simplifying
9x2 = 12 + 7x

Solving
9x2 = 12 + 7x

Solving for variable 'x'.

Reorder the terms:
-12 + -7x + 9x2 = 12 + 7x + -12 + -7x

Reorder the terms:
-12 + -7x + 9x2 = 12 + -12 + 7x + -7x

Combine like terms: 12 + -12 = 0
-12 + -7x + 9x2 = 0 + 7x + -7x
-12 + -7x + 9x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
-12 + -7x + 9x2 = 0

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

Divide each side by '9'.
-1.333333333 + -0.7777777778x + x2 = 0

Move the constant term to the right:

Add '1.333333333' to each side of the equation.
-1.333333333 + -0.7777777778x + 1.333333333 + x2 = 0 + 1.333333333

Reorder the terms:
-1.333333333 + 1.333333333 + -0.7777777778x + x2 = 0 + 1.333333333

Combine like terms: -1.333333333 + 1.333333333 = 0.000000000
0.000000000 + -0.7777777778x + x2 = 0 + 1.333333333
-0.7777777778x + x2 = 0 + 1.333333333

Combine like terms: 0 + 1.333333333 = 1.333333333
-0.7777777778x + x2 = 1.333333333

The x term is -0.7777777778x.  Take half its coefficient (-0.3888888889).
Square it (0.1512345679) and add it to both sides.

Add '0.1512345679' to each side of the equation.
-0.7777777778x + 0.1512345679 + x2 = 1.333333333 + 0.1512345679

Reorder the terms:
0.1512345679 + -0.7777777778x + x2 = 1.333333333 + 0.1512345679

Combine like terms: 1.333333333 + 0.1512345679 = 1.4845679009
0.1512345679 + -0.7777777778x + x2 = 1.4845679009

Factor a perfect square on the left side:
(x + -0.3888888889)(x + -0.3888888889) = 1.4845679009

Calculate the square root of the right side: 1.218428455

Break this problem into two subproblems by setting 
(x + -0.3888888889) equal to 1.218428455 and -1.218428455.

Subproblem 1

x + -0.3888888889 = 1.218428455 Simplifying x + -0.3888888889 = 1.218428455 Reorder the terms: -0.3888888889 + x = 1.218428455 Solving -0.3888888889 + x = 1.218428455 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3888888889' to each side of the equation. -0.3888888889 + 0.3888888889 + x = 1.218428455 + 0.3888888889 Combine like terms: -0.3888888889 + 0.3888888889 = 0.0000000000 0.0000000000 + x = 1.218428455 + 0.3888888889 x = 1.218428455 + 0.3888888889 Combine like terms: 1.218428455 + 0.3888888889 = 1.6073173439 x = 1.6073173439 Simplifying x = 1.6073173439

Subproblem 2

x + -0.3888888889 = -1.218428455 Simplifying x + -0.3888888889 = -1.218428455 Reorder the terms: -0.3888888889 + x = -1.218428455 Solving -0.3888888889 + x = -1.218428455 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3888888889' to each side of the equation. -0.3888888889 + 0.3888888889 + x = -1.218428455 + 0.3888888889 Combine like terms: -0.3888888889 + 0.3888888889 = 0.0000000000 0.0000000000 + x = -1.218428455 + 0.3888888889 x = -1.218428455 + 0.3888888889 Combine like terms: -1.218428455 + 0.3888888889 = -0.8295395661 x = -0.8295395661 Simplifying x = -0.8295395661

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.6073173439, -0.8295395661}

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