x^2-12x-9=10

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Solution for x^2-12x-9=10 equation:


Simplifying
x2 + -12x + -9 = 10

Reorder the terms:
-9 + -12x + x2 = 10

Solving
-9 + -12x + x2 = 10

Solving for variable 'x'.

Reorder the terms:
-9 + -10 + -12x + x2 = 10 + -10

Combine like terms: -9 + -10 = -19
-19 + -12x + x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-19 + -12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + -12x + 19 + x2 = 0 + 19

Reorder the terms:
-19 + 19 + -12x + x2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + -12x + x2 = 0 + 19
-12x + x2 = 0 + 19

Combine like terms: 0 + 19 = 19
-12x + x2 = 19

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 = 19 + 36

Reorder the terms:
36 + -12x + x2 = 19 + 36

Combine like terms: 19 + 36 = 55
36 + -12x + x2 = 55

Factor a perfect square on the left side:
(x + -6)(x + -6) = 55

Calculate the square root of the right side: 7.416198487

Break this problem into two subproblems by setting 
(x + -6) equal to 7.416198487 and -7.416198487.

Subproblem 1

x + -6 = 7.416198487 Simplifying x + -6 = 7.416198487 Reorder the terms: -6 + x = 7.416198487 Solving -6 + x = 7.416198487 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 = 7.416198487 + 6 Combine like terms: -6 + 6 = 0 0 + x = 7.416198487 + 6 x = 7.416198487 + 6 Combine like terms: 7.416198487 + 6 = 13.416198487 x = 13.416198487 Simplifying x = 13.416198487

Subproblem 2

x + -6 = -7.416198487 Simplifying x + -6 = -7.416198487 Reorder the terms: -6 + x = -7.416198487 Solving -6 + x = -7.416198487 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 = -7.416198487 + 6 Combine like terms: -6 + 6 = 0 0 + x = -7.416198487 + 6 x = -7.416198487 + 6 Combine like terms: -7.416198487 + 6 = -1.416198487 x = -1.416198487 Simplifying x = -1.416198487

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.416198487, -1.416198487}

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