5x^2-17x-9=12

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Solution for 5x^2-17x-9=12 equation:


Simplifying
5x2 + -17x + -9 = 12

Reorder the terms:
-9 + -17x + 5x2 = 12

Solving
-9 + -17x + 5x2 = 12

Solving for variable 'x'.

Reorder the terms:
-9 + -12 + -17x + 5x2 = 12 + -12

Combine like terms: -9 + -12 = -21
-21 + -17x + 5x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-21 + -17x + 5x2 = 0

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

Divide each side by '5'.
-4.2 + -3.4x + x2 = 0

Move the constant term to the right:

Add '4.2' to each side of the equation.
-4.2 + -3.4x + 4.2 + x2 = 0 + 4.2

Reorder the terms:
-4.2 + 4.2 + -3.4x + x2 = 0 + 4.2

Combine like terms: -4.2 + 4.2 = 0.0
0.0 + -3.4x + x2 = 0 + 4.2
-3.4x + x2 = 0 + 4.2

Combine like terms: 0 + 4.2 = 4.2
-3.4x + x2 = 4.2

The x term is -3.4x.  Take half its coefficient (-1.7).
Square it (2.89) and add it to both sides.

Add '2.89' to each side of the equation.
-3.4x + 2.89 + x2 = 4.2 + 2.89

Reorder the terms:
2.89 + -3.4x + x2 = 4.2 + 2.89

Combine like terms: 4.2 + 2.89 = 7.09
2.89 + -3.4x + x2 = 7.09

Factor a perfect square on the left side:
(x + -1.7)(x + -1.7) = 7.09

Calculate the square root of the right side: 2.662705391

Break this problem into two subproblems by setting 
(x + -1.7) equal to 2.662705391 and -2.662705391.

Subproblem 1

x + -1.7 = 2.662705391 Simplifying x + -1.7 = 2.662705391 Reorder the terms: -1.7 + x = 2.662705391 Solving -1.7 + x = 2.662705391 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.7' to each side of the equation. -1.7 + 1.7 + x = 2.662705391 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + x = 2.662705391 + 1.7 x = 2.662705391 + 1.7 Combine like terms: 2.662705391 + 1.7 = 4.362705391 x = 4.362705391 Simplifying x = 4.362705391

Subproblem 2

x + -1.7 = -2.662705391 Simplifying x + -1.7 = -2.662705391 Reorder the terms: -1.7 + x = -2.662705391 Solving -1.7 + x = -2.662705391 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.7' to each side of the equation. -1.7 + 1.7 + x = -2.662705391 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + x = -2.662705391 + 1.7 x = -2.662705391 + 1.7 Combine like terms: -2.662705391 + 1.7 = -0.962705391 x = -0.962705391 Simplifying x = -0.962705391

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.362705391, -0.962705391}

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