x^2+17x-12=0

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Solution for x^2+17x-12=0 equation:


Simplifying
x2 + 17x + -12 = 0

Reorder the terms:
-12 + 17x + x2 = 0

Solving
-12 + 17x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 17x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + 17x + x2 = 0 + 12

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

Combine like terms: 0 + 12 = 12
17x + x2 = 12

The x term is 17x.  Take half its coefficient (8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
17x + 72.25 + x2 = 12 + 72.25

Reorder the terms:
72.25 + 17x + x2 = 12 + 72.25

Combine like terms: 12 + 72.25 = 84.25
72.25 + 17x + x2 = 84.25

Factor a perfect square on the left side:
(x + 8.5)(x + 8.5) = 84.25

Calculate the square root of the right side: 9.178779875

Break this problem into two subproblems by setting 
(x + 8.5) equal to 9.178779875 and -9.178779875.

Subproblem 1

x + 8.5 = 9.178779875 Simplifying x + 8.5 = 9.178779875 Reorder the terms: 8.5 + x = 9.178779875 Solving 8.5 + x = 9.178779875 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + x = 9.178779875 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + x = 9.178779875 + -8.5 x = 9.178779875 + -8.5 Combine like terms: 9.178779875 + -8.5 = 0.678779875 x = 0.678779875 Simplifying x = 0.678779875

Subproblem 2

x + 8.5 = -9.178779875 Simplifying x + 8.5 = -9.178779875 Reorder the terms: 8.5 + x = -9.178779875 Solving 8.5 + x = -9.178779875 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + x = -9.178779875 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + x = -9.178779875 + -8.5 x = -9.178779875 + -8.5 Combine like terms: -9.178779875 + -8.5 = -17.678779875 x = -17.678779875 Simplifying x = -17.678779875

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.678779875, -17.678779875}

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