x^2-17x-171=0

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Solution for x^2-17x-171=0 equation:


Simplifying
x2 + -17x + -171 = 0

Reorder the terms:
-171 + -17x + x2 = 0

Solving
-171 + -17x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '171' to each side of the equation.
-171 + -17x + 171 + x2 = 0 + 171

Reorder the terms:
-171 + 171 + -17x + x2 = 0 + 171

Combine like terms: -171 + 171 = 0
0 + -17x + x2 = 0 + 171
-17x + x2 = 0 + 171

Combine like terms: 0 + 171 = 171
-17x + x2 = 171

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 = 171 + 72.25

Reorder the terms:
72.25 + -17x + x2 = 171 + 72.25

Combine like terms: 171 + 72.25 = 243.25
72.25 + -17x + x2 = 243.25

Factor a perfect square on the left side:
(x + -8.5)(x + -8.5) = 243.25

Calculate the square root of the right side: 15.59647396

Break this problem into two subproblems by setting 
(x + -8.5) equal to 15.59647396 and -15.59647396.

Subproblem 1

x + -8.5 = 15.59647396 Simplifying x + -8.5 = 15.59647396 Reorder the terms: -8.5 + x = 15.59647396 Solving -8.5 + x = 15.59647396 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 = 15.59647396 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + x = 15.59647396 + 8.5 x = 15.59647396 + 8.5 Combine like terms: 15.59647396 + 8.5 = 24.09647396 x = 24.09647396 Simplifying x = 24.09647396

Subproblem 2

x + -8.5 = -15.59647396 Simplifying x + -8.5 = -15.59647396 Reorder the terms: -8.5 + x = -15.59647396 Solving -8.5 + x = -15.59647396 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 = -15.59647396 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + x = -15.59647396 + 8.5 x = -15.59647396 + 8.5 Combine like terms: -15.59647396 + 8.5 = -7.09647396 x = -7.09647396 Simplifying x = -7.09647396

Solution

The solution to the problem is based on the solutions from the subproblems. x = {24.09647396, -7.09647396}

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