x^2+20*x-500=0

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Solution for x^2+20*x-500=0 equation:


Simplifying
x2 + 20x + -500 = 0

Reorder the terms:
-500 + 20x + x2 = 0

Solving
-500 + 20x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '500' to each side of the equation.
-500 + 20x + 500 + x2 = 0 + 500

Reorder the terms:
-500 + 500 + 20x + x2 = 0 + 500

Combine like terms: -500 + 500 = 0
0 + 20x + x2 = 0 + 500
20x + x2 = 0 + 500

Combine like terms: 0 + 500 = 500
20x + x2 = 500

The x term is 20x.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20x + 100 + x2 = 500 + 100

Reorder the terms:
100 + 20x + x2 = 500 + 100

Combine like terms: 500 + 100 = 600
100 + 20x + x2 = 600

Factor a perfect square on the left side:
(x + 10)(x + 10) = 600

Calculate the square root of the right side: 24.494897428

Break this problem into two subproblems by setting 
(x + 10) equal to 24.494897428 and -24.494897428.

Subproblem 1

x + 10 = 24.494897428 Simplifying x + 10 = 24.494897428 Reorder the terms: 10 + x = 24.494897428 Solving 10 + x = 24.494897428 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 24.494897428 + -10 Combine like terms: 10 + -10 = 0 0 + x = 24.494897428 + -10 x = 24.494897428 + -10 Combine like terms: 24.494897428 + -10 = 14.494897428 x = 14.494897428 Simplifying x = 14.494897428

Subproblem 2

x + 10 = -24.494897428 Simplifying x + 10 = -24.494897428 Reorder the terms: 10 + x = -24.494897428 Solving 10 + x = -24.494897428 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -24.494897428 + -10 Combine like terms: 10 + -10 = 0 0 + x = -24.494897428 + -10 x = -24.494897428 + -10 Combine like terms: -24.494897428 + -10 = -34.494897428 x = -34.494897428 Simplifying x = -34.494897428

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.494897428, -34.494897428}

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