x^2+40x+80=0

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Solution for x^2+40x+80=0 equation:


Simplifying
x2 + 40x + 80 = 0

Reorder the terms:
80 + 40x + x2 = 0

Solving
80 + 40x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-80' to each side of the equation.
80 + 40x + -80 + x2 = 0 + -80

Reorder the terms:
80 + -80 + 40x + x2 = 0 + -80

Combine like terms: 80 + -80 = 0
0 + 40x + x2 = 0 + -80
40x + x2 = 0 + -80

Combine like terms: 0 + -80 = -80
40x + x2 = -80

The x term is 40x.  Take half its coefficient (20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
40x + 400 + x2 = -80 + 400

Reorder the terms:
400 + 40x + x2 = -80 + 400

Combine like terms: -80 + 400 = 320
400 + 40x + x2 = 320

Factor a perfect square on the left side:
(x + 20)(x + 20) = 320

Calculate the square root of the right side: 17.88854382

Break this problem into two subproblems by setting 
(x + 20) equal to 17.88854382 and -17.88854382.

Subproblem 1

x + 20 = 17.88854382 Simplifying x + 20 = 17.88854382 Reorder the terms: 20 + x = 17.88854382 Solving 20 + x = 17.88854382 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + x = 17.88854382 + -20 Combine like terms: 20 + -20 = 0 0 + x = 17.88854382 + -20 x = 17.88854382 + -20 Combine like terms: 17.88854382 + -20 = -2.11145618 x = -2.11145618 Simplifying x = -2.11145618

Subproblem 2

x + 20 = -17.88854382 Simplifying x + 20 = -17.88854382 Reorder the terms: 20 + x = -17.88854382 Solving 20 + x = -17.88854382 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + x = -17.88854382 + -20 Combine like terms: 20 + -20 = 0 0 + x = -17.88854382 + -20 x = -17.88854382 + -20 Combine like terms: -17.88854382 + -20 = -37.88854382 x = -37.88854382 Simplifying x = -37.88854382

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.11145618, -37.88854382}

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