x=x^2+12x-45

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Solution for x=x^2+12x-45 equation:


Simplifying
x = x2 + 12x + -45

Reorder the terms:
x = -45 + 12x + x2

Solving
x = -45 + 12x + x2

Solving for variable 'x'.

Reorder the terms:
45 + x + -12x + -1x2 = -45 + 12x + x2 + 45 + -12x + -1x2

Combine like terms: x + -12x = -11x
45 + -11x + -1x2 = -45 + 12x + x2 + 45 + -12x + -1x2

Reorder the terms:
45 + -11x + -1x2 = -45 + 45 + 12x + -12x + x2 + -1x2

Combine like terms: -45 + 45 = 0
45 + -11x + -1x2 = 0 + 12x + -12x + x2 + -1x2
45 + -11x + -1x2 = 12x + -12x + x2 + -1x2

Combine like terms: 12x + -12x = 0
45 + -11x + -1x2 = 0 + x2 + -1x2
45 + -11x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
45 + -11x + -1x2 = 0

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

Divide each side by '-1'.
-45 + 11x + x2 = 0

Move the constant term to the right:

Add '45' to each side of the equation.
-45 + 11x + 45 + x2 = 0 + 45

Reorder the terms:
-45 + 45 + 11x + x2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + 11x + x2 = 0 + 45
11x + x2 = 0 + 45

Combine like terms: 0 + 45 = 45
11x + x2 = 45

The x term is 11x.  Take half its coefficient (5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
11x + 30.25 + x2 = 45 + 30.25

Reorder the terms:
30.25 + 11x + x2 = 45 + 30.25

Combine like terms: 45 + 30.25 = 75.25
30.25 + 11x + x2 = 75.25

Factor a perfect square on the left side:
(x + 5.5)(x + 5.5) = 75.25

Calculate the square root of the right side: 8.674675786

Break this problem into two subproblems by setting 
(x + 5.5) equal to 8.674675786 and -8.674675786.

Subproblem 1

x + 5.5 = 8.674675786 Simplifying x + 5.5 = 8.674675786 Reorder the terms: 5.5 + x = 8.674675786 Solving 5.5 + x = 8.674675786 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = 8.674675786 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 8.674675786 + -5.5 x = 8.674675786 + -5.5 Combine like terms: 8.674675786 + -5.5 = 3.174675786 x = 3.174675786 Simplifying x = 3.174675786

Subproblem 2

x + 5.5 = -8.674675786 Simplifying x + 5.5 = -8.674675786 Reorder the terms: 5.5 + x = -8.674675786 Solving 5.5 + x = -8.674675786 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = -8.674675786 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -8.674675786 + -5.5 x = -8.674675786 + -5.5 Combine like terms: -8.674675786 + -5.5 = -14.174675786 x = -14.174675786 Simplifying x = -14.174675786

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.174675786, -14.174675786}

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