9x^2-25=6x

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


Simplifying
9x2 + -25 = 6x

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

Solving
-25 + 9x2 = 6x

Solving for variable 'x'.

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

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

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

Divide each side by '9'.
-2.777777778 + -0.6666666667x + x2 = 0

Move the constant term to the right:

Add '2.777777778' to each side of the equation.
-2.777777778 + -0.6666666667x + 2.777777778 + x2 = 0 + 2.777777778

Reorder the terms:
-2.777777778 + 2.777777778 + -0.6666666667x + x2 = 0 + 2.777777778

Combine like terms: -2.777777778 + 2.777777778 = 0.000000000
0.000000000 + -0.6666666667x + x2 = 0 + 2.777777778
-0.6666666667x + x2 = 0 + 2.777777778

Combine like terms: 0 + 2.777777778 = 2.777777778
-0.6666666667x + x2 = 2.777777778

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 = 2.777777778 + 0.1111111112

Reorder the terms:
0.1111111112 + -0.6666666667x + x2 = 2.777777778 + 0.1111111112

Combine like terms: 2.777777778 + 0.1111111112 = 2.8888888892
0.1111111112 + -0.6666666667x + x2 = 2.8888888892

Factor a perfect square on the left side:
(x + -0.3333333334)(x + -0.3333333334) = 2.8888888892

Calculate the square root of the right side: 1.699673171

Break this problem into two subproblems by setting 
(x + -0.3333333334) equal to 1.699673171 and -1.699673171.

Subproblem 1

x + -0.3333333334 = 1.699673171 Simplifying x + -0.3333333334 = 1.699673171 Reorder the terms: -0.3333333334 + x = 1.699673171 Solving -0.3333333334 + x = 1.699673171 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 = 1.699673171 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = 1.699673171 + 0.3333333334 x = 1.699673171 + 0.3333333334 Combine like terms: 1.699673171 + 0.3333333334 = 2.0330065044 x = 2.0330065044 Simplifying x = 2.0330065044

Subproblem 2

x + -0.3333333334 = -1.699673171 Simplifying x + -0.3333333334 = -1.699673171 Reorder the terms: -0.3333333334 + x = -1.699673171 Solving -0.3333333334 + x = -1.699673171 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 = -1.699673171 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = -1.699673171 + 0.3333333334 x = -1.699673171 + 0.3333333334 Combine like terms: -1.699673171 + 0.3333333334 = -1.3663398376 x = -1.3663398376 Simplifying x = -1.3663398376

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.0330065044, -1.3663398376}

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