x^2+20x-4900=0

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Solution for x^2+20x-4900=0 equation:


Simplifying
x2 + 20x + -4900 = 0

Reorder the terms:
-4900 + 20x + x2 = 0

Solving
-4900 + 20x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '4900' to each side of the equation.
-4900 + 20x + 4900 + x2 = 0 + 4900

Reorder the terms:
-4900 + 4900 + 20x + x2 = 0 + 4900

Combine like terms: -4900 + 4900 = 0
0 + 20x + x2 = 0 + 4900
20x + x2 = 0 + 4900

Combine like terms: 0 + 4900 = 4900
20x + x2 = 4900

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 = 4900 + 100

Reorder the terms:
100 + 20x + x2 = 4900 + 100

Combine like terms: 4900 + 100 = 5000
100 + 20x + x2 = 5000

Factor a perfect square on the left side:
(x + 10)(x + 10) = 5000

Calculate the square root of the right side: 70.710678119

Break this problem into two subproblems by setting 
(x + 10) equal to 70.710678119 and -70.710678119.

Subproblem 1

x + 10 = 70.710678119 Simplifying x + 10 = 70.710678119 Reorder the terms: 10 + x = 70.710678119 Solving 10 + x = 70.710678119 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 = 70.710678119 + -10 Combine like terms: 10 + -10 = 0 0 + x = 70.710678119 + -10 x = 70.710678119 + -10 Combine like terms: 70.710678119 + -10 = 60.710678119 x = 60.710678119 Simplifying x = 60.710678119

Subproblem 2

x + 10 = -70.710678119 Simplifying x + 10 = -70.710678119 Reorder the terms: 10 + x = -70.710678119 Solving 10 + x = -70.710678119 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 = -70.710678119 + -10 Combine like terms: 10 + -10 = 0 0 + x = -70.710678119 + -10 x = -70.710678119 + -10 Combine like terms: -70.710678119 + -10 = -80.710678119 x = -80.710678119 Simplifying x = -80.710678119

Solution

The solution to the problem is based on the solutions from the subproblems. x = {60.710678119, -80.710678119}

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