x^2-12x=7

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Solution for x^2-12x=7 equation:


Simplifying
x2 + -12x = 7

Reorder the terms:
-12x + x2 = 7

Solving
-12x + x2 = 7

Solving for variable 'x'.

Reorder the terms:
-7 + -12x + x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + -12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -12x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + -12x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -12x + x2 = 0 + 7
-12x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
-12x + x2 = 7

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 = 7 + 36

Reorder the terms:
36 + -12x + x2 = 7 + 36

Combine like terms: 7 + 36 = 43
36 + -12x + x2 = 43

Factor a perfect square on the left side:
(x + -6)(x + -6) = 43

Calculate the square root of the right side: 6.557438524

Break this problem into two subproblems by setting 
(x + -6) equal to 6.557438524 and -6.557438524.

Subproblem 1

x + -6 = 6.557438524 Simplifying x + -6 = 6.557438524 Reorder the terms: -6 + x = 6.557438524 Solving -6 + x = 6.557438524 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 = 6.557438524 + 6 Combine like terms: -6 + 6 = 0 0 + x = 6.557438524 + 6 x = 6.557438524 + 6 Combine like terms: 6.557438524 + 6 = 12.557438524 x = 12.557438524 Simplifying x = 12.557438524

Subproblem 2

x + -6 = -6.557438524 Simplifying x + -6 = -6.557438524 Reorder the terms: -6 + x = -6.557438524 Solving -6 + x = -6.557438524 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 = -6.557438524 + 6 Combine like terms: -6 + 6 = 0 0 + x = -6.557438524 + 6 x = -6.557438524 + 6 Combine like terms: -6.557438524 + 6 = -0.557438524 x = -0.557438524 Simplifying x = -0.557438524

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.557438524, -0.557438524}

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