x^2-85x-158=0

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Solution for x^2-85x-158=0 equation:


Simplifying
x2 + -85x + -158 = 0

Reorder the terms:
-158 + -85x + x2 = 0

Solving
-158 + -85x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '158' to each side of the equation.
-158 + -85x + 158 + x2 = 0 + 158

Reorder the terms:
-158 + 158 + -85x + x2 = 0 + 158

Combine like terms: -158 + 158 = 0
0 + -85x + x2 = 0 + 158
-85x + x2 = 0 + 158

Combine like terms: 0 + 158 = 158
-85x + x2 = 158

The x term is -85x.  Take half its coefficient (-42.5).
Square it (1806.25) and add it to both sides.

Add '1806.25' to each side of the equation.
-85x + 1806.25 + x2 = 158 + 1806.25

Reorder the terms:
1806.25 + -85x + x2 = 158 + 1806.25

Combine like terms: 158 + 1806.25 = 1964.25
1806.25 + -85x + x2 = 1964.25

Factor a perfect square on the left side:
(x + -42.5)(x + -42.5) = 1964.25

Calculate the square root of the right side: 44.319860108

Break this problem into two subproblems by setting 
(x + -42.5) equal to 44.319860108 and -44.319860108.

Subproblem 1

x + -42.5 = 44.319860108 Simplifying x + -42.5 = 44.319860108 Reorder the terms: -42.5 + x = 44.319860108 Solving -42.5 + x = 44.319860108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '42.5' to each side of the equation. -42.5 + 42.5 + x = 44.319860108 + 42.5 Combine like terms: -42.5 + 42.5 = 0.0 0.0 + x = 44.319860108 + 42.5 x = 44.319860108 + 42.5 Combine like terms: 44.319860108 + 42.5 = 86.819860108 x = 86.819860108 Simplifying x = 86.819860108

Subproblem 2

x + -42.5 = -44.319860108 Simplifying x + -42.5 = -44.319860108 Reorder the terms: -42.5 + x = -44.319860108 Solving -42.5 + x = -44.319860108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '42.5' to each side of the equation. -42.5 + 42.5 + x = -44.319860108 + 42.5 Combine like terms: -42.5 + 42.5 = 0.0 0.0 + x = -44.319860108 + 42.5 x = -44.319860108 + 42.5 Combine like terms: -44.319860108 + 42.5 = -1.819860108 x = -1.819860108 Simplifying x = -1.819860108

Solution

The solution to the problem is based on the solutions from the subproblems. x = {86.819860108, -1.819860108}

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