9x^2-3=12+11x

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Solution for 9x^2-3=12+11x equation:


Simplifying
9x2 + -3 = 12 + 11x

Reorder the terms:
-3 + 9x2 = 12 + 11x

Solving
-3 + 9x2 = 12 + 11x

Solving for variable 'x'.

Reorder the terms:
-3 + -12 + -11x + 9x2 = 12 + 11x + -12 + -11x

Combine like terms: -3 + -12 = -15
-15 + -11x + 9x2 = 12 + 11x + -12 + -11x

Reorder the terms:
-15 + -11x + 9x2 = 12 + -12 + 11x + -11x

Combine like terms: 12 + -12 = 0
-15 + -11x + 9x2 = 0 + 11x + -11x
-15 + -11x + 9x2 = 11x + -11x

Combine like terms: 11x + -11x = 0
-15 + -11x + 9x2 = 0

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

Divide each side by '9'.
-1.666666667 + -1.222222222x + x2 = 0

Move the constant term to the right:

Add '1.666666667' to each side of the equation.
-1.666666667 + -1.222222222x + 1.666666667 + x2 = 0 + 1.666666667

Reorder the terms:
-1.666666667 + 1.666666667 + -1.222222222x + x2 = 0 + 1.666666667

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + -1.222222222x + x2 = 0 + 1.666666667
-1.222222222x + x2 = 0 + 1.666666667

Combine like terms: 0 + 1.666666667 = 1.666666667
-1.222222222x + x2 = 1.666666667

The x term is -1.222222222x.  Take half its coefficient (-0.611111111).
Square it (0.3734567900) and add it to both sides.

Add '0.3734567900' to each side of the equation.
-1.222222222x + 0.3734567900 + x2 = 1.666666667 + 0.3734567900

Reorder the terms:
0.3734567900 + -1.222222222x + x2 = 1.666666667 + 0.3734567900

Combine like terms: 1.666666667 + 0.3734567900 = 2.040123457
0.3734567900 + -1.222222222x + x2 = 2.040123457

Factor a perfect square on the left side:
(x + -0.611111111)(x + -0.611111111) = 2.040123457

Calculate the square root of the right side: 1.428328904

Break this problem into two subproblems by setting 
(x + -0.611111111) equal to 1.428328904 and -1.428328904.

Subproblem 1

x + -0.611111111 = 1.428328904 Simplifying x + -0.611111111 = 1.428328904 Reorder the terms: -0.611111111 + x = 1.428328904 Solving -0.611111111 + x = 1.428328904 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.611111111' to each side of the equation. -0.611111111 + 0.611111111 + x = 1.428328904 + 0.611111111 Combine like terms: -0.611111111 + 0.611111111 = 0.000000000 0.000000000 + x = 1.428328904 + 0.611111111 x = 1.428328904 + 0.611111111 Combine like terms: 1.428328904 + 0.611111111 = 2.039440015 x = 2.039440015 Simplifying x = 2.039440015

Subproblem 2

x + -0.611111111 = -1.428328904 Simplifying x + -0.611111111 = -1.428328904 Reorder the terms: -0.611111111 + x = -1.428328904 Solving -0.611111111 + x = -1.428328904 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.611111111' to each side of the equation. -0.611111111 + 0.611111111 + x = -1.428328904 + 0.611111111 Combine like terms: -0.611111111 + 0.611111111 = 0.000000000 0.000000000 + x = -1.428328904 + 0.611111111 x = -1.428328904 + 0.611111111 Combine like terms: -1.428328904 + 0.611111111 = -0.817217793 x = -0.817217793 Simplifying x = -0.817217793

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.039440015, -0.817217793}

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