9x^2=8-3x

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Solution for 9x^2=8-3x equation:


Simplifying
9x2 = 8 + -3x

Solving
9x2 = 8 + -3x

Solving for variable 'x'.

Reorder the terms:
-8 + 3x + 9x2 = 8 + -3x + -8 + 3x

Reorder the terms:
-8 + 3x + 9x2 = 8 + -8 + -3x + 3x

Combine like terms: 8 + -8 = 0
-8 + 3x + 9x2 = 0 + -3x + 3x
-8 + 3x + 9x2 = -3x + 3x

Combine like terms: -3x + 3x = 0
-8 + 3x + 9x2 = 0

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

Divide each side by '9'.
-0.8888888889 + 0.3333333333x + x2 = 0

Move the constant term to the right:

Add '0.8888888889' to each side of the equation.
-0.8888888889 + 0.3333333333x + 0.8888888889 + x2 = 0 + 0.8888888889

Reorder the terms:
-0.8888888889 + 0.8888888889 + 0.3333333333x + x2 = 0 + 0.8888888889

Combine like terms: -0.8888888889 + 0.8888888889 = 0.0000000000
0.0000000000 + 0.3333333333x + x2 = 0 + 0.8888888889
0.3333333333x + x2 = 0 + 0.8888888889

Combine like terms: 0 + 0.8888888889 = 0.8888888889
0.3333333333x + x2 = 0.8888888889

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 = 0.8888888889 + 0.02777777779

Reorder the terms:
0.02777777779 + 0.3333333333x + x2 = 0.8888888889 + 0.02777777779

Combine like terms: 0.8888888889 + 0.02777777779 = 0.91666666669
0.02777777779 + 0.3333333333x + x2 = 0.91666666669

Factor a perfect square on the left side:
(x + 0.1666666667)(x + 0.1666666667) = 0.91666666669

Calculate the square root of the right side: 0.957427108

Break this problem into two subproblems by setting 
(x + 0.1666666667) equal to 0.957427108 and -0.957427108.

Subproblem 1

x + 0.1666666667 = 0.957427108 Simplifying x + 0.1666666667 = 0.957427108 Reorder the terms: 0.1666666667 + x = 0.957427108 Solving 0.1666666667 + x = 0.957427108 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 = 0.957427108 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + x = 0.957427108 + -0.1666666667 x = 0.957427108 + -0.1666666667 Combine like terms: 0.957427108 + -0.1666666667 = 0.7907604413 x = 0.7907604413 Simplifying x = 0.7907604413

Subproblem 2

x + 0.1666666667 = -0.957427108 Simplifying x + 0.1666666667 = -0.957427108 Reorder the terms: 0.1666666667 + x = -0.957427108 Solving 0.1666666667 + x = -0.957427108 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 = -0.957427108 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + x = -0.957427108 + -0.1666666667 x = -0.957427108 + -0.1666666667 Combine like terms: -0.957427108 + -0.1666666667 = -1.1240937747 x = -1.1240937747 Simplifying x = -1.1240937747

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.7907604413, -1.1240937747}

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