x^2+20x=10

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Solution for x^2+20x=10 equation:


Simplifying
x2 + 20x = 10

Reorder the terms:
20x + x2 = 10

Solving
20x + x2 = 10

Solving for variable 'x'.

Reorder the terms:
-10 + 20x + x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-10 + 20x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 20x + 10 + x2 = 0 + 10

Reorder the terms:
-10 + 10 + 20x + x2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 20x + x2 = 0 + 10
20x + x2 = 0 + 10

Combine like terms: 0 + 10 = 10
20x + x2 = 10

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 = 10 + 100

Reorder the terms:
100 + 20x + x2 = 10 + 100

Combine like terms: 10 + 100 = 110
100 + 20x + x2 = 110

Factor a perfect square on the left side:
(x + 10)(x + 10) = 110

Calculate the square root of the right side: 10.488088482

Break this problem into two subproblems by setting 
(x + 10) equal to 10.488088482 and -10.488088482.

Subproblem 1

x + 10 = 10.488088482 Simplifying x + 10 = 10.488088482 Reorder the terms: 10 + x = 10.488088482 Solving 10 + x = 10.488088482 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 = 10.488088482 + -10 Combine like terms: 10 + -10 = 0 0 + x = 10.488088482 + -10 x = 10.488088482 + -10 Combine like terms: 10.488088482 + -10 = 0.488088482 x = 0.488088482 Simplifying x = 0.488088482

Subproblem 2

x + 10 = -10.488088482 Simplifying x + 10 = -10.488088482 Reorder the terms: 10 + x = -10.488088482 Solving 10 + x = -10.488088482 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 = -10.488088482 + -10 Combine like terms: 10 + -10 = 0 0 + x = -10.488088482 + -10 x = -10.488088482 + -10 Combine like terms: -10.488088482 + -10 = -20.488088482 x = -20.488088482 Simplifying x = -20.488088482

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.488088482, -20.488088482}

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