x^2+20x=150

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Solution for x^2+20x=150 equation:


Simplifying
x2 + 20x = 150

Reorder the terms:
20x + x2 = 150

Solving
20x + x2 = 150

Solving for variable 'x'.

Reorder the terms:
-150 + 20x + x2 = 150 + -150

Combine like terms: 150 + -150 = 0
-150 + 20x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '150' to each side of the equation.
-150 + 20x + 150 + x2 = 0 + 150

Reorder the terms:
-150 + 150 + 20x + x2 = 0 + 150

Combine like terms: -150 + 150 = 0
0 + 20x + x2 = 0 + 150
20x + x2 = 0 + 150

Combine like terms: 0 + 150 = 150
20x + x2 = 150

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 = 150 + 100

Reorder the terms:
100 + 20x + x2 = 150 + 100

Combine like terms: 150 + 100 = 250
100 + 20x + x2 = 250

Factor a perfect square on the left side:
(x + 10)(x + 10) = 250

Calculate the square root of the right side: 15.811388301

Break this problem into two subproblems by setting 
(x + 10) equal to 15.811388301 and -15.811388301.

Subproblem 1

x + 10 = 15.811388301 Simplifying x + 10 = 15.811388301 Reorder the terms: 10 + x = 15.811388301 Solving 10 + x = 15.811388301 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 = 15.811388301 + -10 Combine like terms: 10 + -10 = 0 0 + x = 15.811388301 + -10 x = 15.811388301 + -10 Combine like terms: 15.811388301 + -10 = 5.811388301 x = 5.811388301 Simplifying x = 5.811388301

Subproblem 2

x + 10 = -15.811388301 Simplifying x + 10 = -15.811388301 Reorder the terms: 10 + x = -15.811388301 Solving 10 + x = -15.811388301 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 = -15.811388301 + -10 Combine like terms: 10 + -10 = 0 0 + x = -15.811388301 + -10 x = -15.811388301 + -10 Combine like terms: -15.811388301 + -10 = -25.811388301 x = -25.811388301 Simplifying x = -25.811388301

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.811388301, -25.811388301}

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