x^2+20x=8

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Solution for x^2+20x=8 equation:


Simplifying
x2 + 20x = 8

Reorder the terms:
20x + x2 = 8

Solving
20x + x2 = 8

Solving for variable 'x'.

Reorder the terms:
-8 + 20x + x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + 20x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 20x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + 20x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 20x + x2 = 0 + 8
20x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
20x + x2 = 8

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 = 8 + 100

Reorder the terms:
100 + 20x + x2 = 8 + 100

Combine like terms: 8 + 100 = 108
100 + 20x + x2 = 108

Factor a perfect square on the left side:
(x + 10)(x + 10) = 108

Calculate the square root of the right side: 10.392304845

Break this problem into two subproblems by setting 
(x + 10) equal to 10.392304845 and -10.392304845.

Subproblem 1

x + 10 = 10.392304845 Simplifying x + 10 = 10.392304845 Reorder the terms: 10 + x = 10.392304845 Solving 10 + x = 10.392304845 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 = 10.392304845 + -10 Combine like terms: 10 + -10 = 0 0 + x = 10.392304845 + -10 x = 10.392304845 + -10 Combine like terms: 10.392304845 + -10 = 0.392304845 x = 0.392304845 Simplifying x = 0.392304845

Subproblem 2

x + 10 = -10.392304845 Simplifying x + 10 = -10.392304845 Reorder the terms: 10 + x = -10.392304845 Solving 10 + x = -10.392304845 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 = -10.392304845 + -10 Combine like terms: 10 + -10 = 0 0 + x = -10.392304845 + -10 x = -10.392304845 + -10 Combine like terms: -10.392304845 + -10 = -20.392304845 x = -20.392304845 Simplifying x = -20.392304845

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.392304845, -20.392304845}

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