x^2-80x-160=0

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Solution for x^2-80x-160=0 equation:


Simplifying
x2 + -80x + -160 = 0

Reorder the terms:
-160 + -80x + x2 = 0

Solving
-160 + -80x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '160' to each side of the equation.
-160 + -80x + 160 + x2 = 0 + 160

Reorder the terms:
-160 + 160 + -80x + x2 = 0 + 160

Combine like terms: -160 + 160 = 0
0 + -80x + x2 = 0 + 160
-80x + x2 = 0 + 160

Combine like terms: 0 + 160 = 160
-80x + x2 = 160

The x term is -80x.  Take half its coefficient (-40).
Square it (1600) and add it to both sides.

Add '1600' to each side of the equation.
-80x + 1600 + x2 = 160 + 1600

Reorder the terms:
1600 + -80x + x2 = 160 + 1600

Combine like terms: 160 + 1600 = 1760
1600 + -80x + x2 = 1760

Factor a perfect square on the left side:
(x + -40)(x + -40) = 1760

Calculate the square root of the right side: 41.952353927

Break this problem into two subproblems by setting 
(x + -40) equal to 41.952353927 and -41.952353927.

Subproblem 1

x + -40 = 41.952353927 Simplifying x + -40 = 41.952353927 Reorder the terms: -40 + x = 41.952353927 Solving -40 + x = 41.952353927 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = 41.952353927 + 40 Combine like terms: -40 + 40 = 0 0 + x = 41.952353927 + 40 x = 41.952353927 + 40 Combine like terms: 41.952353927 + 40 = 81.952353927 x = 81.952353927 Simplifying x = 81.952353927

Subproblem 2

x + -40 = -41.952353927 Simplifying x + -40 = -41.952353927 Reorder the terms: -40 + x = -41.952353927 Solving -40 + x = -41.952353927 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = -41.952353927 + 40 Combine like terms: -40 + 40 = 0 0 + x = -41.952353927 + 40 x = -41.952353927 + 40 Combine like terms: -41.952353927 + 40 = -1.952353927 x = -1.952353927 Simplifying x = -1.952353927

Solution

The solution to the problem is based on the solutions from the subproblems. x = {81.952353927, -1.952353927}

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