x^2-20x=100

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Solution for x^2-20x=100 equation:


Simplifying
x2 + -20x = 100

Reorder the terms:
-20x + x2 = 100

Solving
-20x + x2 = 100

Solving for variable 'x'.

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

Combine like terms: 100 + -100 = 0
-100 + -20x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + -20x + 100 + x2 = 0 + 100

Reorder the terms:
-100 + 100 + -20x + x2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + -20x + x2 = 0 + 100
-20x + x2 = 0 + 100

Combine like terms: 0 + 100 = 100
-20x + x2 = 100

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 = 100 + 100

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

Combine like terms: 100 + 100 = 200
100 + -20x + x2 = 200

Factor a perfect square on the left side:
(x + -10)(x + -10) = 200

Calculate the square root of the right side: 14.142135624

Break this problem into two subproblems by setting 
(x + -10) equal to 14.142135624 and -14.142135624.

Subproblem 1

x + -10 = 14.142135624 Simplifying x + -10 = 14.142135624 Reorder the terms: -10 + x = 14.142135624 Solving -10 + x = 14.142135624 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 = 14.142135624 + 10 Combine like terms: -10 + 10 = 0 0 + x = 14.142135624 + 10 x = 14.142135624 + 10 Combine like terms: 14.142135624 + 10 = 24.142135624 x = 24.142135624 Simplifying x = 24.142135624

Subproblem 2

x + -10 = -14.142135624 Simplifying x + -10 = -14.142135624 Reorder the terms: -10 + x = -14.142135624 Solving -10 + x = -14.142135624 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 = -14.142135624 + 10 Combine like terms: -10 + 10 = 0 0 + x = -14.142135624 + 10 x = -14.142135624 + 10 Combine like terms: -14.142135624 + 10 = -4.142135624 x = -4.142135624 Simplifying x = -4.142135624

Solution

The solution to the problem is based on the solutions from the subproblems. x = {24.142135624, -4.142135624}

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