12x^2+9x-2=17

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Solution for 12x^2+9x-2=17 equation:


Simplifying
12x2 + 9x + -2 = 17

Reorder the terms:
-2 + 9x + 12x2 = 17

Solving
-2 + 9x + 12x2 = 17

Solving for variable 'x'.

Reorder the terms:
-2 + -17 + 9x + 12x2 = 17 + -17

Combine like terms: -2 + -17 = -19
-19 + 9x + 12x2 = 17 + -17

Combine like terms: 17 + -17 = 0
-19 + 9x + 12x2 = 0

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

Divide each side by '12'.
-1.583333333 + 0.75x + x2 = 0

Move the constant term to the right:

Add '1.583333333' to each side of the equation.
-1.583333333 + 0.75x + 1.583333333 + x2 = 0 + 1.583333333

Reorder the terms:
-1.583333333 + 1.583333333 + 0.75x + x2 = 0 + 1.583333333

Combine like terms: -1.583333333 + 1.583333333 = 0.000000000
0.000000000 + 0.75x + x2 = 0 + 1.583333333
0.75x + x2 = 0 + 1.583333333

Combine like terms: 0 + 1.583333333 = 1.583333333
0.75x + x2 = 1.583333333

The x term is 0.75x.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75x + 0.140625 + x2 = 1.583333333 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = 1.583333333 + 0.140625

Combine like terms: 1.583333333 + 0.140625 = 1.723958333
0.140625 + 0.75x + x2 = 1.723958333

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = 1.723958333

Calculate the square root of the right side: 1.312995938

Break this problem into two subproblems by setting 
(x + 0.375) equal to 1.312995938 and -1.312995938.

Subproblem 1

x + 0.375 = 1.312995938 Simplifying x + 0.375 = 1.312995938 Reorder the terms: 0.375 + x = 1.312995938 Solving 0.375 + x = 1.312995938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = 1.312995938 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = 1.312995938 + -0.375 x = 1.312995938 + -0.375 Combine like terms: 1.312995938 + -0.375 = 0.937995938 x = 0.937995938 Simplifying x = 0.937995938

Subproblem 2

x + 0.375 = -1.312995938 Simplifying x + 0.375 = -1.312995938 Reorder the terms: 0.375 + x = -1.312995938 Solving 0.375 + x = -1.312995938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = -1.312995938 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = -1.312995938 + -0.375 x = -1.312995938 + -0.375 Combine like terms: -1.312995938 + -0.375 = -1.687995938 x = -1.687995938 Simplifying x = -1.687995938

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.937995938, -1.687995938}

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