X^2-12X=100

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Solution for X^2-12X=100 equation:


Simplifying
X2 + -12X = 100

Reorder the terms:
-12X + X2 = 100

Solving
-12X + X2 = 100

Solving for variable 'X'.

Reorder the terms:
-100 + -12X + X2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + -12X + X2 = 0

Begin completing the square.

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + -12X + 100 + X2 = 0 + 100

Reorder the terms:
-100 + 100 + -12X + X2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + -12X + X2 = 0 + 100
-12X + X2 = 0 + 100

Combine like terms: 0 + 100 = 100
-12X + X2 = 100

The X term is -12X.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12X + 36 + X2 = 100 + 36

Reorder the terms:
36 + -12X + X2 = 100 + 36

Combine like terms: 100 + 36 = 136
36 + -12X + X2 = 136

Factor a perfect square on the left side:
(X + -6)(X + -6) = 136

Calculate the square root of the right side: 11.66190379

Break this problem into two subproblems by setting 
(X + -6) equal to 11.66190379 and -11.66190379.

Subproblem 1

X + -6 = 11.66190379 Simplifying X + -6 = 11.66190379 Reorder the terms: -6 + X = 11.66190379 Solving -6 + X = 11.66190379 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + X = 11.66190379 + 6 Combine like terms: -6 + 6 = 0 0 + X = 11.66190379 + 6 X = 11.66190379 + 6 Combine like terms: 11.66190379 + 6 = 17.66190379 X = 17.66190379 Simplifying X = 17.66190379

Subproblem 2

X + -6 = -11.66190379 Simplifying X + -6 = -11.66190379 Reorder the terms: -6 + X = -11.66190379 Solving -6 + X = -11.66190379 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + X = -11.66190379 + 6 Combine like terms: -6 + 6 = 0 0 + X = -11.66190379 + 6 X = -11.66190379 + 6 Combine like terms: -11.66190379 + 6 = -5.66190379 X = -5.66190379 Simplifying X = -5.66190379

Solution

The solution to the problem is based on the solutions from the subproblems. X = {17.66190379, -5.66190379}

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