x^2+20x=11

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Solution for x^2+20x=11 equation:


Simplifying
x2 + 20x = 11

Reorder the terms:
20x + x2 = 11

Solving
20x + x2 = 11

Solving for variable 'x'.

Reorder the terms:
-11 + 20x + x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + 20x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + 20x + 11 + x2 = 0 + 11

Reorder the terms:
-11 + 11 + 20x + x2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 20x + x2 = 0 + 11
20x + x2 = 0 + 11

Combine like terms: 0 + 11 = 11
20x + x2 = 11

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 = 11 + 100

Reorder the terms:
100 + 20x + x2 = 11 + 100

Combine like terms: 11 + 100 = 111
100 + 20x + x2 = 111

Factor a perfect square on the left side:
(x + 10)(x + 10) = 111

Calculate the square root of the right side: 10.535653753

Break this problem into two subproblems by setting 
(x + 10) equal to 10.535653753 and -10.535653753.

Subproblem 1

x + 10 = 10.535653753 Simplifying x + 10 = 10.535653753 Reorder the terms: 10 + x = 10.535653753 Solving 10 + x = 10.535653753 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 = 10.535653753 + -10 Combine like terms: 10 + -10 = 0 0 + x = 10.535653753 + -10 x = 10.535653753 + -10 Combine like terms: 10.535653753 + -10 = 0.535653753 x = 0.535653753 Simplifying x = 0.535653753

Subproblem 2

x + 10 = -10.535653753 Simplifying x + 10 = -10.535653753 Reorder the terms: 10 + x = -10.535653753 Solving 10 + x = -10.535653753 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 = -10.535653753 + -10 Combine like terms: 10 + -10 = 0 0 + x = -10.535653753 + -10 x = -10.535653753 + -10 Combine like terms: -10.535653753 + -10 = -20.535653753 x = -20.535653753 Simplifying x = -20.535653753

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.535653753, -20.535653753}

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