13x-2=9x^2

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Solution for 13x-2=9x^2 equation:


Simplifying
13x + -2 = 9x2

Reorder the terms:
-2 + 13x = 9x2

Solving
-2 + 13x = 9x2

Solving for variable 'x'.

Combine like terms: 9x2 + -9x2 = 0
-2 + 13x + -9x2 = 0

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

Divide each side by '-9'.
0.2222222222 + -1.444444444x + x2 = 0

Move the constant term to the right:

Add '-0.2222222222' to each side of the equation.
0.2222222222 + -1.444444444x + -0.2222222222 + x2 = 0 + -0.2222222222

Reorder the terms:
0.2222222222 + -0.2222222222 + -1.444444444x + x2 = 0 + -0.2222222222

Combine like terms: 0.2222222222 + -0.2222222222 = 0.0000000000
0.0000000000 + -1.444444444x + x2 = 0 + -0.2222222222
-1.444444444x + x2 = 0 + -0.2222222222

Combine like terms: 0 + -0.2222222222 = -0.2222222222
-1.444444444x + x2 = -0.2222222222

The x term is -1.444444444x.  Take half its coefficient (-0.722222222).
Square it (0.5216049380) and add it to both sides.

Add '0.5216049380' to each side of the equation.
-1.444444444x + 0.5216049380 + x2 = -0.2222222222 + 0.5216049380

Reorder the terms:
0.5216049380 + -1.444444444x + x2 = -0.2222222222 + 0.5216049380

Combine like terms: -0.2222222222 + 0.5216049380 = 0.2993827158
0.5216049380 + -1.444444444x + x2 = 0.2993827158

Factor a perfect square on the left side:
(x + -0.722222222)(x + -0.722222222) = 0.2993827158

Calculate the square root of the right side: 0.547158767

Break this problem into two subproblems by setting 
(x + -0.722222222) equal to 0.547158767 and -0.547158767.

Subproblem 1

x + -0.722222222 = 0.547158767 Simplifying x + -0.722222222 = 0.547158767 Reorder the terms: -0.722222222 + x = 0.547158767 Solving -0.722222222 + x = 0.547158767 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.722222222' to each side of the equation. -0.722222222 + 0.722222222 + x = 0.547158767 + 0.722222222 Combine like terms: -0.722222222 + 0.722222222 = 0.000000000 0.000000000 + x = 0.547158767 + 0.722222222 x = 0.547158767 + 0.722222222 Combine like terms: 0.547158767 + 0.722222222 = 1.269380989 x = 1.269380989 Simplifying x = 1.269380989

Subproblem 2

x + -0.722222222 = -0.547158767 Simplifying x + -0.722222222 = -0.547158767 Reorder the terms: -0.722222222 + x = -0.547158767 Solving -0.722222222 + x = -0.547158767 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.722222222' to each side of the equation. -0.722222222 + 0.722222222 + x = -0.547158767 + 0.722222222 Combine like terms: -0.722222222 + 0.722222222 = 0.000000000 0.000000000 + x = -0.547158767 + 0.722222222 x = -0.547158767 + 0.722222222 Combine like terms: -0.547158767 + 0.722222222 = 0.175063455 x = 0.175063455 Simplifying x = 0.175063455

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.269380989, 0.175063455}

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