x=9x^2+15x-276

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Solution for x=9x^2+15x-276 equation:


Simplifying
x = 9x2 + 15x + -276

Reorder the terms:
x = -276 + 15x + 9x2

Solving
x = -276 + 15x + 9x2

Solving for variable 'x'.

Reorder the terms:
276 + x + -15x + -9x2 = -276 + 15x + 9x2 + 276 + -15x + -9x2

Combine like terms: x + -15x = -14x
276 + -14x + -9x2 = -276 + 15x + 9x2 + 276 + -15x + -9x2

Reorder the terms:
276 + -14x + -9x2 = -276 + 276 + 15x + -15x + 9x2 + -9x2

Combine like terms: -276 + 276 = 0
276 + -14x + -9x2 = 0 + 15x + -15x + 9x2 + -9x2
276 + -14x + -9x2 = 15x + -15x + 9x2 + -9x2

Combine like terms: 15x + -15x = 0
276 + -14x + -9x2 = 0 + 9x2 + -9x2
276 + -14x + -9x2 = 9x2 + -9x2

Combine like terms: 9x2 + -9x2 = 0
276 + -14x + -9x2 = 0

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

Divide each side by '-9'.
-30.66666667 + 1.555555556x + x2 = 0

Move the constant term to the right:

Add '30.66666667' to each side of the equation.
-30.66666667 + 1.555555556x + 30.66666667 + x2 = 0 + 30.66666667

Reorder the terms:
-30.66666667 + 30.66666667 + 1.555555556x + x2 = 0 + 30.66666667

Combine like terms: -30.66666667 + 30.66666667 = 0.00000000
0.00000000 + 1.555555556x + x2 = 0 + 30.66666667
1.555555556x + x2 = 0 + 30.66666667

Combine like terms: 0 + 30.66666667 = 30.66666667
1.555555556x + x2 = 30.66666667

The x term is 1.555555556x.  Take half its coefficient (0.777777778).
Square it (0.6049382720) and add it to both sides.

Add '0.6049382720' to each side of the equation.
1.555555556x + 0.6049382720 + x2 = 30.66666667 + 0.6049382720

Reorder the terms:
0.6049382720 + 1.555555556x + x2 = 30.66666667 + 0.6049382720

Combine like terms: 30.66666667 + 0.6049382720 = 31.271604942
0.6049382720 + 1.555555556x + x2 = 31.271604942

Factor a perfect square on the left side:
(x + 0.777777778)(x + 0.777777778) = 31.271604942

Calculate the square root of the right side: 5.592102015

Break this problem into two subproblems by setting 
(x + 0.777777778) equal to 5.592102015 and -5.592102015.

Subproblem 1

x + 0.777777778 = 5.592102015 Simplifying x + 0.777777778 = 5.592102015 Reorder the terms: 0.777777778 + x = 5.592102015 Solving 0.777777778 + x = 5.592102015 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.777777778' to each side of the equation. 0.777777778 + -0.777777778 + x = 5.592102015 + -0.777777778 Combine like terms: 0.777777778 + -0.777777778 = 0.000000000 0.000000000 + x = 5.592102015 + -0.777777778 x = 5.592102015 + -0.777777778 Combine like terms: 5.592102015 + -0.777777778 = 4.814324237 x = 4.814324237 Simplifying x = 4.814324237

Subproblem 2

x + 0.777777778 = -5.592102015 Simplifying x + 0.777777778 = -5.592102015 Reorder the terms: 0.777777778 + x = -5.592102015 Solving 0.777777778 + x = -5.592102015 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.777777778' to each side of the equation. 0.777777778 + -0.777777778 + x = -5.592102015 + -0.777777778 Combine like terms: 0.777777778 + -0.777777778 = 0.000000000 0.000000000 + x = -5.592102015 + -0.777777778 x = -5.592102015 + -0.777777778 Combine like terms: -5.592102015 + -0.777777778 = -6.369879793 x = -6.369879793 Simplifying x = -6.369879793

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.814324237, -6.369879793}

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