0=-9x^2+5x+6

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Solution for 0=-9x^2+5x+6 equation:


Simplifying
0 = -9x2 + 5x + 6

Reorder the terms:
0 = 6 + 5x + -9x2

Solving
0 = 6 + 5x + -9x2

Solving for variable 'x'.

Combine like terms: 0 + -6 = -6
-6 + -5x + 9x2 = 6 + 5x + -9x2 + -6 + -5x + 9x2

Reorder the terms:
-6 + -5x + 9x2 = 6 + -6 + 5x + -5x + -9x2 + 9x2

Combine like terms: 6 + -6 = 0
-6 + -5x + 9x2 = 0 + 5x + -5x + -9x2 + 9x2
-6 + -5x + 9x2 = 5x + -5x + -9x2 + 9x2

Combine like terms: 5x + -5x = 0
-6 + -5x + 9x2 = 0 + -9x2 + 9x2
-6 + -5x + 9x2 = -9x2 + 9x2

Combine like terms: -9x2 + 9x2 = 0
-6 + -5x + 9x2 = 0

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

Divide each side by '9'.
-0.6666666667 + -0.5555555556x + x2 = 0

Move the constant term to the right:

Add '0.6666666667' to each side of the equation.
-0.6666666667 + -0.5555555556x + 0.6666666667 + x2 = 0 + 0.6666666667

Reorder the terms:
-0.6666666667 + 0.6666666667 + -0.5555555556x + x2 = 0 + 0.6666666667

Combine like terms: -0.6666666667 + 0.6666666667 = 0.0000000000
0.0000000000 + -0.5555555556x + x2 = 0 + 0.6666666667
-0.5555555556x + x2 = 0 + 0.6666666667

Combine like terms: 0 + 0.6666666667 = 0.6666666667
-0.5555555556x + x2 = 0.6666666667

The x term is -0.5555555556x.  Take half its coefficient (-0.2777777778).
Square it (0.07716049384) and add it to both sides.

Add '0.07716049384' to each side of the equation.
-0.5555555556x + 0.07716049384 + x2 = 0.6666666667 + 0.07716049384

Reorder the terms:
0.07716049384 + -0.5555555556x + x2 = 0.6666666667 + 0.07716049384

Combine like terms: 0.6666666667 + 0.07716049384 = 0.74382716054
0.07716049384 + -0.5555555556x + x2 = 0.74382716054

Factor a perfect square on the left side:
(x + -0.2777777778)(x + -0.2777777778) = 0.74382716054

Calculate the square root of the right side: 0.86245415

Break this problem into two subproblems by setting 
(x + -0.2777777778) equal to 0.86245415 and -0.86245415.

Subproblem 1

x + -0.2777777778 = 0.86245415 Simplifying x + -0.2777777778 = 0.86245415 Reorder the terms: -0.2777777778 + x = 0.86245415 Solving -0.2777777778 + x = 0.86245415 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2777777778' to each side of the equation. -0.2777777778 + 0.2777777778 + x = 0.86245415 + 0.2777777778 Combine like terms: -0.2777777778 + 0.2777777778 = 0.0000000000 0.0000000000 + x = 0.86245415 + 0.2777777778 x = 0.86245415 + 0.2777777778 Combine like terms: 0.86245415 + 0.2777777778 = 1.1402319278 x = 1.1402319278 Simplifying x = 1.1402319278

Subproblem 2

x + -0.2777777778 = -0.86245415 Simplifying x + -0.2777777778 = -0.86245415 Reorder the terms: -0.2777777778 + x = -0.86245415 Solving -0.2777777778 + x = -0.86245415 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2777777778' to each side of the equation. -0.2777777778 + 0.2777777778 + x = -0.86245415 + 0.2777777778 Combine like terms: -0.2777777778 + 0.2777777778 = 0.0000000000 0.0000000000 + x = -0.86245415 + 0.2777777778 x = -0.86245415 + 0.2777777778 Combine like terms: -0.86245415 + 0.2777777778 = -0.5846763722 x = -0.5846763722 Simplifying x = -0.5846763722

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.1402319278, -0.5846763722}

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