7-12x-x^2=0

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Solution for 7-12x-x^2=0 equation:


Simplifying
7 + -12x + -1x2 = 0

Solving
7 + -12x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-7 + 12x + x2 = 0

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 = 0.557438524 x = 0.557438524 Simplifying x = 0.557438524

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 = -12.557438524 x = -12.557438524 Simplifying x = -12.557438524

Solution

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

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