9x^2=6x+4

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Solution for 9x^2=6x+4 equation:


Simplifying
9x2 = 6x + 4

Reorder the terms:
9x2 = 4 + 6x

Solving
9x2 = 4 + 6x

Solving for variable 'x'.

Reorder the terms:
-4 + -6x + 9x2 = 4 + 6x + -4 + -6x

Reorder the terms:
-4 + -6x + 9x2 = 4 + -4 + 6x + -6x

Combine like terms: 4 + -4 = 0
-4 + -6x + 9x2 = 0 + 6x + -6x
-4 + -6x + 9x2 = 6x + -6x

Combine like terms: 6x + -6x = 0
-4 + -6x + 9x2 = 0

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

Divide each side by '9'.
-0.4444444444 + -0.6666666667x + x2 = 0

Move the constant term to the right:

Add '0.4444444444' to each side of the equation.
-0.4444444444 + -0.6666666667x + 0.4444444444 + x2 = 0 + 0.4444444444

Reorder the terms:
-0.4444444444 + 0.4444444444 + -0.6666666667x + x2 = 0 + 0.4444444444

Combine like terms: -0.4444444444 + 0.4444444444 = 0.0000000000
0.0000000000 + -0.6666666667x + x2 = 0 + 0.4444444444
-0.6666666667x + x2 = 0 + 0.4444444444

Combine like terms: 0 + 0.4444444444 = 0.4444444444
-0.6666666667x + x2 = 0.4444444444

The x term is -0.6666666667x.  Take half its coefficient (-0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
-0.6666666667x + 0.1111111112 + x2 = 0.4444444444 + 0.1111111112

Reorder the terms:
0.1111111112 + -0.6666666667x + x2 = 0.4444444444 + 0.1111111112

Combine like terms: 0.4444444444 + 0.1111111112 = 0.5555555556
0.1111111112 + -0.6666666667x + x2 = 0.5555555556

Factor a perfect square on the left side:
(x + -0.3333333334)(x + -0.3333333334) = 0.5555555556

Calculate the square root of the right side: 0.745355993

Break this problem into two subproblems by setting 
(x + -0.3333333334) equal to 0.745355993 and -0.745355993.

Subproblem 1

x + -0.3333333334 = 0.745355993 Simplifying x + -0.3333333334 = 0.745355993 Reorder the terms: -0.3333333334 + x = 0.745355993 Solving -0.3333333334 + x = 0.745355993 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + x = 0.745355993 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = 0.745355993 + 0.3333333334 x = 0.745355993 + 0.3333333334 Combine like terms: 0.745355993 + 0.3333333334 = 1.0786893264 x = 1.0786893264 Simplifying x = 1.0786893264

Subproblem 2

x + -0.3333333334 = -0.745355993 Simplifying x + -0.3333333334 = -0.745355993 Reorder the terms: -0.3333333334 + x = -0.745355993 Solving -0.3333333334 + x = -0.745355993 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + x = -0.745355993 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = -0.745355993 + 0.3333333334 x = -0.745355993 + 0.3333333334 Combine like terms: -0.745355993 + 0.3333333334 = -0.4120226596 x = -0.4120226596 Simplifying x = -0.4120226596

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.0786893264, -0.4120226596}

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