9x^2-25x-6=9

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


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

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

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

Solving for variable 'x'.

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

Combine like terms: -6 + -9 = -15
-15 + -25x + 9x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-15 + -25x + 9x2 = 0

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

Divide each side by '9'.
-1.666666667 + -2.777777778x + x2 = 0

Move the constant term to the right:

Add '1.666666667' to each side of the equation.
-1.666666667 + -2.777777778x + 1.666666667 + x2 = 0 + 1.666666667

Reorder the terms:
-1.666666667 + 1.666666667 + -2.777777778x + x2 = 0 + 1.666666667

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + -2.777777778x + x2 = 0 + 1.666666667
-2.777777778x + x2 = 0 + 1.666666667

Combine like terms: 0 + 1.666666667 = 1.666666667
-2.777777778x + x2 = 1.666666667

The x term is -2.777777778x.  Take half its coefficient (-1.388888889).
Square it (1.929012346) and add it to both sides.

Add '1.929012346' to each side of the equation.
-2.777777778x + 1.929012346 + x2 = 1.666666667 + 1.929012346

Reorder the terms:
1.929012346 + -2.777777778x + x2 = 1.666666667 + 1.929012346

Combine like terms: 1.666666667 + 1.929012346 = 3.595679013
1.929012346 + -2.777777778x + x2 = 3.595679013

Factor a perfect square on the left side:
(x + -1.388888889)(x + -1.388888889) = 3.595679013

Calculate the square root of the right side: 1.896227574

Break this problem into two subproblems by setting 
(x + -1.388888889) equal to 1.896227574 and -1.896227574.

Subproblem 1

x + -1.388888889 = 1.896227574 Simplifying x + -1.388888889 = 1.896227574 Reorder the terms: -1.388888889 + x = 1.896227574 Solving -1.388888889 + x = 1.896227574 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.388888889' to each side of the equation. -1.388888889 + 1.388888889 + x = 1.896227574 + 1.388888889 Combine like terms: -1.388888889 + 1.388888889 = 0.000000000 0.000000000 + x = 1.896227574 + 1.388888889 x = 1.896227574 + 1.388888889 Combine like terms: 1.896227574 + 1.388888889 = 3.285116463 x = 3.285116463 Simplifying x = 3.285116463

Subproblem 2

x + -1.388888889 = -1.896227574 Simplifying x + -1.388888889 = -1.896227574 Reorder the terms: -1.388888889 + x = -1.896227574 Solving -1.388888889 + x = -1.896227574 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.388888889' to each side of the equation. -1.388888889 + 1.388888889 + x = -1.896227574 + 1.388888889 Combine like terms: -1.388888889 + 1.388888889 = 0.000000000 0.000000000 + x = -1.896227574 + 1.388888889 x = -1.896227574 + 1.388888889 Combine like terms: -1.896227574 + 1.388888889 = -0.507338685 x = -0.507338685 Simplifying x = -0.507338685

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.285116463, -0.507338685}

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