x^2+40x-10000=0

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Solution for x^2+40x-10000=0 equation:


Simplifying
x2 + 40x + -10000 = 0

Reorder the terms:
-10000 + 40x + x2 = 0

Solving
-10000 + 40x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '10000' to each side of the equation.
-10000 + 40x + 10000 + x2 = 0 + 10000

Reorder the terms:
-10000 + 10000 + 40x + x2 = 0 + 10000

Combine like terms: -10000 + 10000 = 0
0 + 40x + x2 = 0 + 10000
40x + x2 = 0 + 10000

Combine like terms: 0 + 10000 = 10000
40x + x2 = 10000

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 = 10000 + 400

Reorder the terms:
400 + 40x + x2 = 10000 + 400

Combine like terms: 10000 + 400 = 10400
400 + 40x + x2 = 10400

Factor a perfect square on the left side:
(x + 20)(x + 20) = 10400

Calculate the square root of the right side: 101.980390272

Break this problem into two subproblems by setting 
(x + 20) equal to 101.980390272 and -101.980390272.

Subproblem 1

x + 20 = 101.980390272 Simplifying x + 20 = 101.980390272 Reorder the terms: 20 + x = 101.980390272 Solving 20 + x = 101.980390272 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 = 101.980390272 + -20 Combine like terms: 20 + -20 = 0 0 + x = 101.980390272 + -20 x = 101.980390272 + -20 Combine like terms: 101.980390272 + -20 = 81.980390272 x = 81.980390272 Simplifying x = 81.980390272

Subproblem 2

x + 20 = -101.980390272 Simplifying x + 20 = -101.980390272 Reorder the terms: 20 + x = -101.980390272 Solving 20 + x = -101.980390272 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 = -101.980390272 + -20 Combine like terms: 20 + -20 = 0 0 + x = -101.980390272 + -20 x = -101.980390272 + -20 Combine like terms: -101.980390272 + -20 = -121.980390272 x = -121.980390272 Simplifying x = -121.980390272

Solution

The solution to the problem is based on the solutions from the subproblems. x = {81.980390272, -121.980390272}

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