x^2+40x-1000=0

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Solution for x^2+40x-1000=0 equation:


Simplifying
x2 + 40x + -1000 = 0

Reorder the terms:
-1000 + 40x + x2 = 0

Solving
-1000 + 40x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1000' to each side of the equation.
-1000 + 40x + 1000 + x2 = 0 + 1000

Reorder the terms:
-1000 + 1000 + 40x + x2 = 0 + 1000

Combine like terms: -1000 + 1000 = 0
0 + 40x + x2 = 0 + 1000
40x + x2 = 0 + 1000

Combine like terms: 0 + 1000 = 1000
40x + x2 = 1000

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 = 1000 + 400

Reorder the terms:
400 + 40x + x2 = 1000 + 400

Combine like terms: 1000 + 400 = 1400
400 + 40x + x2 = 1400

Factor a perfect square on the left side:
(x + 20)(x + 20) = 1400

Calculate the square root of the right side: 37.416573868

Break this problem into two subproblems by setting 
(x + 20) equal to 37.416573868 and -37.416573868.

Subproblem 1

x + 20 = 37.416573868 Simplifying x + 20 = 37.416573868 Reorder the terms: 20 + x = 37.416573868 Solving 20 + x = 37.416573868 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 = 37.416573868 + -20 Combine like terms: 20 + -20 = 0 0 + x = 37.416573868 + -20 x = 37.416573868 + -20 Combine like terms: 37.416573868 + -20 = 17.416573868 x = 17.416573868 Simplifying x = 17.416573868

Subproblem 2

x + 20 = -37.416573868 Simplifying x + 20 = -37.416573868 Reorder the terms: 20 + x = -37.416573868 Solving 20 + x = -37.416573868 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 = -37.416573868 + -20 Combine like terms: 20 + -20 = 0 0 + x = -37.416573868 + -20 x = -37.416573868 + -20 Combine like terms: -37.416573868 + -20 = -57.416573868 x = -57.416573868 Simplifying x = -57.416573868

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.416573868, -57.416573868}

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