x=-4x^2-12x+9

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Solution for x=-4x^2-12x+9 equation:


Simplifying
x = -4x2 + -12x + 9

Reorder the terms:
x = 9 + -12x + -4x2

Solving
x = 9 + -12x + -4x2

Solving for variable 'x'.

Reorder the terms:
-9 + x + 12x + 4x2 = 9 + -12x + -4x2 + -9 + 12x + 4x2

Combine like terms: x + 12x = 13x
-9 + 13x + 4x2 = 9 + -12x + -4x2 + -9 + 12x + 4x2

Reorder the terms:
-9 + 13x + 4x2 = 9 + -9 + -12x + 12x + -4x2 + 4x2

Combine like terms: 9 + -9 = 0
-9 + 13x + 4x2 = 0 + -12x + 12x + -4x2 + 4x2
-9 + 13x + 4x2 = -12x + 12x + -4x2 + 4x2

Combine like terms: -12x + 12x = 0
-9 + 13x + 4x2 = 0 + -4x2 + 4x2
-9 + 13x + 4x2 = -4x2 + 4x2

Combine like terms: -4x2 + 4x2 = 0
-9 + 13x + 4x2 = 0

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

Divide each side by '4'.
-2.25 + 3.25x + x2 = 0

Move the constant term to the right:

Add '2.25' to each side of the equation.
-2.25 + 3.25x + 2.25 + x2 = 0 + 2.25

Reorder the terms:
-2.25 + 2.25 + 3.25x + x2 = 0 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + 3.25x + x2 = 0 + 2.25
3.25x + x2 = 0 + 2.25

Combine like terms: 0 + 2.25 = 2.25
3.25x + x2 = 2.25

The x term is 3.25x.  Take half its coefficient (1.625).
Square it (2.640625) and add it to both sides.

Add '2.640625' to each side of the equation.
3.25x + 2.640625 + x2 = 2.25 + 2.640625

Reorder the terms:
2.640625 + 3.25x + x2 = 2.25 + 2.640625

Combine like terms: 2.25 + 2.640625 = 4.890625
2.640625 + 3.25x + x2 = 4.890625

Factor a perfect square on the left side:
(x + 1.625)(x + 1.625) = 4.890625

Calculate the square root of the right side: 2.211475752

Break this problem into two subproblems by setting 
(x + 1.625) equal to 2.211475752 and -2.211475752.

Subproblem 1

x + 1.625 = 2.211475752 Simplifying x + 1.625 = 2.211475752 Reorder the terms: 1.625 + x = 2.211475752 Solving 1.625 + x = 2.211475752 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.625' to each side of the equation. 1.625 + -1.625 + x = 2.211475752 + -1.625 Combine like terms: 1.625 + -1.625 = 0.000 0.000 + x = 2.211475752 + -1.625 x = 2.211475752 + -1.625 Combine like terms: 2.211475752 + -1.625 = 0.586475752 x = 0.586475752 Simplifying x = 0.586475752

Subproblem 2

x + 1.625 = -2.211475752 Simplifying x + 1.625 = -2.211475752 Reorder the terms: 1.625 + x = -2.211475752 Solving 1.625 + x = -2.211475752 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.625' to each side of the equation. 1.625 + -1.625 + x = -2.211475752 + -1.625 Combine like terms: 1.625 + -1.625 = 0.000 0.000 + x = -2.211475752 + -1.625 x = -2.211475752 + -1.625 Combine like terms: -2.211475752 + -1.625 = -3.836475752 x = -3.836475752 Simplifying x = -3.836475752

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.586475752, -3.836475752}

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