12x+x^2=66

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Solution for 12x+x^2=66 equation:


Simplifying
12x + x2 = 66

Solving
12x + x2 = 66

Solving for variable 'x'.

Reorder the terms:
-66 + 12x + x2 = 66 + -66

Combine like terms: 66 + -66 = 0
-66 + 12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '66' to each side of the equation.
-66 + 12x + 66 + x2 = 0 + 66

Reorder the terms:
-66 + 66 + 12x + x2 = 0 + 66

Combine like terms: -66 + 66 = 0
0 + 12x + x2 = 0 + 66
12x + x2 = 0 + 66

Combine like terms: 0 + 66 = 66
12x + x2 = 66

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 = 66 + 36

Reorder the terms:
36 + 12x + x2 = 66 + 36

Combine like terms: 66 + 36 = 102
36 + 12x + x2 = 102

Factor a perfect square on the left side:
(x + 6)(x + 6) = 102

Calculate the square root of the right side: 10.099504938

Break this problem into two subproblems by setting 
(x + 6) equal to 10.099504938 and -10.099504938.

Subproblem 1

x + 6 = 10.099504938 Simplifying x + 6 = 10.099504938 Reorder the terms: 6 + x = 10.099504938 Solving 6 + x = 10.099504938 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 = 10.099504938 + -6 Combine like terms: 6 + -6 = 0 0 + x = 10.099504938 + -6 x = 10.099504938 + -6 Combine like terms: 10.099504938 + -6 = 4.099504938 x = 4.099504938 Simplifying x = 4.099504938

Subproblem 2

x + 6 = -10.099504938 Simplifying x + 6 = -10.099504938 Reorder the terms: 6 + x = -10.099504938 Solving 6 + x = -10.099504938 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 = -10.099504938 + -6 Combine like terms: 6 + -6 = 0 0 + x = -10.099504938 + -6 x = -10.099504938 + -6 Combine like terms: -10.099504938 + -6 = -16.099504938 x = -16.099504938 Simplifying x = -16.099504938

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.099504938, -16.099504938}

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