x=2.3x^2-9

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Solution for x=2.3x^2-9 equation:


Simplifying
x = 2.3x2 + -9

Reorder the terms:
x = -9 + 2.3x2

Solving
x = -9 + 2.3x2

Solving for variable 'x'.

Reorder the terms:
9 + x + -2.3x2 = -9 + 2.3x2 + 9 + -2.3x2

Reorder the terms:
9 + x + -2.3x2 = -9 + 9 + 2.3x2 + -2.3x2

Combine like terms: -9 + 9 = 0
9 + x + -2.3x2 = 0 + 2.3x2 + -2.3x2
9 + x + -2.3x2 = 2.3x2 + -2.3x2

Combine like terms: 2.3x2 + -2.3x2 = 0.0
9 + x + -2.3x2 = 0.0

Begin completing the square.  Divide all terms by
-2.3 the coefficient of the squared term: 

Divide each side by '-2.3'.
-3.913043478 + -0.4347826087x + x2 = 0

Move the constant term to the right:

Add '3.913043478' to each side of the equation.
-3.913043478 + -0.4347826087x + 3.913043478 + x2 = 0 + 3.913043478

Reorder the terms:
-3.913043478 + 3.913043478 + -0.4347826087x + x2 = 0 + 3.913043478

Combine like terms: -3.913043478 + 3.913043478 = 0.000000000
0.000000000 + -0.4347826087x + x2 = 0 + 3.913043478
-0.4347826087x + x2 = 0 + 3.913043478

Combine like terms: 0 + 3.913043478 = 3.913043478
-0.4347826087x + x2 = 3.913043478

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-0.4347826087x + 0.25 + x2 = 3.913043478 + 0.25

Reorder the terms:
0.25 + -0.4347826087x + x2 = 3.913043478 + 0.25

Combine like terms: 3.913043478 + 0.25 = 4.163043478
0.25 + -0.4347826087x + x2 = 4.163043478

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 4.163043478

Calculate the square root of the right side: 2.040353763

Break this problem into two subproblems by setting 
(x + 0.5) equal to 2.040353763 and -2.040353763.

Subproblem 1

x + 0.5 = 2.040353763 Simplifying x + 0.5 = 2.040353763 Reorder the terms: 0.5 + x = 2.040353763 Solving 0.5 + x = 2.040353763 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 2.040353763 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 2.040353763 + -0.5 x = 2.040353763 + -0.5 Combine like terms: 2.040353763 + -0.5 = 1.540353763 x = 1.540353763 Simplifying x = 1.540353763

Subproblem 2

x + 0.5 = -2.040353763 Simplifying x + 0.5 = -2.040353763 Reorder the terms: 0.5 + x = -2.040353763 Solving 0.5 + x = -2.040353763 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -2.040353763 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -2.040353763 + -0.5 x = -2.040353763 + -0.5 Combine like terms: -2.040353763 + -0.5 = -2.540353763 x = -2.540353763 Simplifying x = -2.540353763

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.540353763, -2.540353763}

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