x^2-12x-210=0

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Solution for x^2-12x-210=0 equation:


Simplifying
x2 + -12x + -210 = 0

Reorder the terms:
-210 + -12x + x2 = 0

Solving
-210 + -12x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '210' to each side of the equation.
-210 + -12x + 210 + x2 = 0 + 210

Reorder the terms:
-210 + 210 + -12x + x2 = 0 + 210

Combine like terms: -210 + 210 = 0
0 + -12x + x2 = 0 + 210
-12x + x2 = 0 + 210

Combine like terms: 0 + 210 = 210
-12x + x2 = 210

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 = 210 + 36

Reorder the terms:
36 + -12x + x2 = 210 + 36

Combine like terms: 210 + 36 = 246
36 + -12x + x2 = 246

Factor a perfect square on the left side:
(x + -6)(x + -6) = 246

Calculate the square root of the right side: 15.684387141

Break this problem into two subproblems by setting 
(x + -6) equal to 15.684387141 and -15.684387141.

Subproblem 1

x + -6 = 15.684387141 Simplifying x + -6 = 15.684387141 Reorder the terms: -6 + x = 15.684387141 Solving -6 + x = 15.684387141 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 = 15.684387141 + 6 Combine like terms: -6 + 6 = 0 0 + x = 15.684387141 + 6 x = 15.684387141 + 6 Combine like terms: 15.684387141 + 6 = 21.684387141 x = 21.684387141 Simplifying x = 21.684387141

Subproblem 2

x + -6 = -15.684387141 Simplifying x + -6 = -15.684387141 Reorder the terms: -6 + x = -15.684387141 Solving -6 + x = -15.684387141 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 = -15.684387141 + 6 Combine like terms: -6 + 6 = 0 0 + x = -15.684387141 + 6 x = -15.684387141 + 6 Combine like terms: -15.684387141 + 6 = -9.684387141 x = -9.684387141 Simplifying x = -9.684387141

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.684387141, -9.684387141}

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