x^2-20x-150=0

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Solution for x^2-20x-150=0 equation:


Simplifying
x2 + -20x + -150 = 0

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

Solving
-150 + -20x + x2 = 0

Solving for variable 'x'.

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 = 25.811388301 x = 25.811388301 Simplifying x = 25.811388301

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 = -5.811388301 x = -5.811388301 Simplifying x = -5.811388301

Solution

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

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