3x^2-12x+12=2x^2+3x-8

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Solution for 3x^2-12x+12=2x^2+3x-8 equation:


Simplifying
3x2 + -12x + 12 = 2x2 + 3x + -8

Reorder the terms:
12 + -12x + 3x2 = 2x2 + 3x + -8

Reorder the terms:
12 + -12x + 3x2 = -8 + 3x + 2x2

Solving
12 + -12x + 3x2 = -8 + 3x + 2x2

Solving for variable 'x'.

Reorder the terms:
12 + 8 + -12x + -3x + 3x2 + -2x2 = -8 + 3x + 2x2 + 8 + -3x + -2x2

Combine like terms: 12 + 8 = 20
20 + -12x + -3x + 3x2 + -2x2 = -8 + 3x + 2x2 + 8 + -3x + -2x2

Combine like terms: -12x + -3x = -15x
20 + -15x + 3x2 + -2x2 = -8 + 3x + 2x2 + 8 + -3x + -2x2

Combine like terms: 3x2 + -2x2 = 1x2
20 + -15x + 1x2 = -8 + 3x + 2x2 + 8 + -3x + -2x2

Reorder the terms:
20 + -15x + 1x2 = -8 + 8 + 3x + -3x + 2x2 + -2x2

Combine like terms: -8 + 8 = 0
20 + -15x + 1x2 = 0 + 3x + -3x + 2x2 + -2x2
20 + -15x + 1x2 = 3x + -3x + 2x2 + -2x2

Combine like terms: 3x + -3x = 0
20 + -15x + 1x2 = 0 + 2x2 + -2x2
20 + -15x + 1x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
20 + -15x + 1x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + -15x + -20 + x2 = 0 + -20

Reorder the terms:
20 + -20 + -15x + x2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -15x + x2 = 0 + -20
-15x + x2 = 0 + -20

Combine like terms: 0 + -20 = -20
-15x + x2 = -20

The x term is -15x.  Take half its coefficient (-7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
-15x + 56.25 + x2 = -20 + 56.25

Reorder the terms:
56.25 + -15x + x2 = -20 + 56.25

Combine like terms: -20 + 56.25 = 36.25
56.25 + -15x + x2 = 36.25

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 36.25

Calculate the square root of the right side: 6.020797289

Break this problem into two subproblems by setting 
(x + -7.5) equal to 6.020797289 and -6.020797289.

Subproblem 1

x + -7.5 = 6.020797289 Simplifying x + -7.5 = 6.020797289 Reorder the terms: -7.5 + x = 6.020797289 Solving -7.5 + x = 6.020797289 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = 6.020797289 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 6.020797289 + 7.5 x = 6.020797289 + 7.5 Combine like terms: 6.020797289 + 7.5 = 13.520797289 x = 13.520797289 Simplifying x = 13.520797289

Subproblem 2

x + -7.5 = -6.020797289 Simplifying x + -7.5 = -6.020797289 Reorder the terms: -7.5 + x = -6.020797289 Solving -7.5 + x = -6.020797289 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = -6.020797289 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -6.020797289 + 7.5 x = -6.020797289 + 7.5 Combine like terms: -6.020797289 + 7.5 = 1.479202711 x = 1.479202711 Simplifying x = 1.479202711

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.520797289, 1.479202711}

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