x^2-28x-12=0

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Solution for x^2-28x-12=0 equation:


Simplifying
x2 + -28x + -12 = 0

Reorder the terms:
-12 + -28x + x2 = 0

Solving
-12 + -28x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -28x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + -28x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -28x + x2 = 0 + 12
-28x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
-28x + x2 = 12

The x term is -28x.  Take half its coefficient (-14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
-28x + 196 + x2 = 12 + 196

Reorder the terms:
196 + -28x + x2 = 12 + 196

Combine like terms: 12 + 196 = 208
196 + -28x + x2 = 208

Factor a perfect square on the left side:
(x + -14)(x + -14) = 208

Calculate the square root of the right side: 14.422205102

Break this problem into two subproblems by setting 
(x + -14) equal to 14.422205102 and -14.422205102.

Subproblem 1

x + -14 = 14.422205102 Simplifying x + -14 = 14.422205102 Reorder the terms: -14 + x = 14.422205102 Solving -14 + x = 14.422205102 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = 14.422205102 + 14 Combine like terms: -14 + 14 = 0 0 + x = 14.422205102 + 14 x = 14.422205102 + 14 Combine like terms: 14.422205102 + 14 = 28.422205102 x = 28.422205102 Simplifying x = 28.422205102

Subproblem 2

x + -14 = -14.422205102 Simplifying x + -14 = -14.422205102 Reorder the terms: -14 + x = -14.422205102 Solving -14 + x = -14.422205102 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = -14.422205102 + 14 Combine like terms: -14 + 14 = 0 0 + x = -14.422205102 + 14 x = -14.422205102 + 14 Combine like terms: -14.422205102 + 14 = -0.422205102 x = -0.422205102 Simplifying x = -0.422205102

Solution

The solution to the problem is based on the solutions from the subproblems. x = {28.422205102, -0.422205102}

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