9(x)=6x^2-25x-9

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Solution for 9(x)=6x^2-25x-9 equation:


Simplifying
9(x) = 6x2 + -25x + -9

Reorder the terms:
9x = -9 + -25x + 6x2

Solving
9x = -9 + -25x + 6x2

Solving for variable 'x'.

Reorder the terms:
9 + 9x + 25x + -6x2 = -9 + -25x + 6x2 + 9 + 25x + -6x2

Combine like terms: 9x + 25x = 34x
9 + 34x + -6x2 = -9 + -25x + 6x2 + 9 + 25x + -6x2

Reorder the terms:
9 + 34x + -6x2 = -9 + 9 + -25x + 25x + 6x2 + -6x2

Combine like terms: -9 + 9 = 0
9 + 34x + -6x2 = 0 + -25x + 25x + 6x2 + -6x2
9 + 34x + -6x2 = -25x + 25x + 6x2 + -6x2

Combine like terms: -25x + 25x = 0
9 + 34x + -6x2 = 0 + 6x2 + -6x2
9 + 34x + -6x2 = 6x2 + -6x2

Combine like terms: 6x2 + -6x2 = 0
9 + 34x + -6x2 = 0

Begin completing the square.  Divide all terms by
-6 the coefficient of the squared term: 

Divide each side by '-6'.
-1.5 + -5.666666667x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -5.666666667x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -5.666666667x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -5.666666667x + x2 = 0 + 1.5
-5.666666667x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-5.666666667x + x2 = 1.5

The x term is -5.666666667x.  Take half its coefficient (-2.833333334).
Square it (8.027777782) and add it to both sides.

Add '8.027777782' to each side of the equation.
-5.666666667x + 8.027777782 + x2 = 1.5 + 8.027777782

Reorder the terms:
8.027777782 + -5.666666667x + x2 = 1.5 + 8.027777782

Combine like terms: 1.5 + 8.027777782 = 9.527777782
8.027777782 + -5.666666667x + x2 = 9.527777782

Factor a perfect square on the left side:
(x + -2.833333334)(x + -2.833333334) = 9.527777782

Calculate the square root of the right side: 3.086709864

Break this problem into two subproblems by setting 
(x + -2.833333334) equal to 3.086709864 and -3.086709864.

Subproblem 1

x + -2.833333334 = 3.086709864 Simplifying x + -2.833333334 = 3.086709864 Reorder the terms: -2.833333334 + x = 3.086709864 Solving -2.833333334 + x = 3.086709864 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.833333334' to each side of the equation. -2.833333334 + 2.833333334 + x = 3.086709864 + 2.833333334 Combine like terms: -2.833333334 + 2.833333334 = 0.000000000 0.000000000 + x = 3.086709864 + 2.833333334 x = 3.086709864 + 2.833333334 Combine like terms: 3.086709864 + 2.833333334 = 5.920043198 x = 5.920043198 Simplifying x = 5.920043198

Subproblem 2

x + -2.833333334 = -3.086709864 Simplifying x + -2.833333334 = -3.086709864 Reorder the terms: -2.833333334 + x = -3.086709864 Solving -2.833333334 + x = -3.086709864 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.833333334' to each side of the equation. -2.833333334 + 2.833333334 + x = -3.086709864 + 2.833333334 Combine like terms: -2.833333334 + 2.833333334 = 0.000000000 0.000000000 + x = -3.086709864 + 2.833333334 x = -3.086709864 + 2.833333334 Combine like terms: -3.086709864 + 2.833333334 = -0.25337653 x = -0.25337653 Simplifying x = -0.25337653

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.920043198, -0.25337653}

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