(3x^3-7x^2+12)-(3x^3+6x^2+10x)=

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Solution for (3x^3-7x^2+12)-(3x^3+6x^2+10x)= equation:


Simplifying
(3x3 + -7x2 + 12) + -1(3x3 + 6x2 + 10x) = 0

Reorder the terms:
(12 + -7x2 + 3x3) + -1(3x3 + 6x2 + 10x) = 0

Remove parenthesis around (12 + -7x2 + 3x3)
12 + -7x2 + 3x3 + -1(3x3 + 6x2 + 10x) = 0

Reorder the terms:
12 + -7x2 + 3x3 + -1(10x + 6x2 + 3x3) = 0
12 + -7x2 + 3x3 + (10x * -1 + 6x2 * -1 + 3x3 * -1) = 0
12 + -7x2 + 3x3 + (-10x + -6x2 + -3x3) = 0

Reorder the terms:
12 + -10x + -7x2 + -6x2 + 3x3 + -3x3 = 0

Combine like terms: -7x2 + -6x2 = -13x2
12 + -10x + -13x2 + 3x3 + -3x3 = 0

Combine like terms: 3x3 + -3x3 = 0
12 + -10x + -13x2 + 0 = 0
12 + -10x + -13x2 = 0

Solving
12 + -10x + -13x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-13 the coefficient of the squared term: 

Divide each side by '-13'.
-0.9230769231 + 0.7692307692x + x2 = 0

Move the constant term to the right:

Add '0.9230769231' to each side of the equation.
-0.9230769231 + 0.7692307692x + 0.9230769231 + x2 = 0 + 0.9230769231

Reorder the terms:
-0.9230769231 + 0.9230769231 + 0.7692307692x + x2 = 0 + 0.9230769231

Combine like terms: -0.9230769231 + 0.9230769231 = 0.0000000000
0.0000000000 + 0.7692307692x + x2 = 0 + 0.9230769231
0.7692307692x + x2 = 0 + 0.9230769231

Combine like terms: 0 + 0.9230769231 = 0.9230769231
0.7692307692x + x2 = 0.9230769231

The x term is 0.7692307692x.  Take half its coefficient (0.3846153846).
Square it (0.1479289941) and add it to both sides.

Add '0.1479289941' to each side of the equation.
0.7692307692x + 0.1479289941 + x2 = 0.9230769231 + 0.1479289941

Reorder the terms:
0.1479289941 + 0.7692307692x + x2 = 0.9230769231 + 0.1479289941

Combine like terms: 0.9230769231 + 0.1479289941 = 1.0710059172
0.1479289941 + 0.7692307692x + x2 = 1.0710059172

Factor a perfect square on the left side:
(x + 0.3846153846)(x + 0.3846153846) = 1.0710059172

Calculate the square root of the right side: 1.034894157

Break this problem into two subproblems by setting 
(x + 0.3846153846) equal to 1.034894157 and -1.034894157.

Subproblem 1

x + 0.3846153846 = 1.034894157 Simplifying x + 0.3846153846 = 1.034894157 Reorder the terms: 0.3846153846 + x = 1.034894157 Solving 0.3846153846 + x = 1.034894157 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3846153846' to each side of the equation. 0.3846153846 + -0.3846153846 + x = 1.034894157 + -0.3846153846 Combine like terms: 0.3846153846 + -0.3846153846 = 0.0000000000 0.0000000000 + x = 1.034894157 + -0.3846153846 x = 1.034894157 + -0.3846153846 Combine like terms: 1.034894157 + -0.3846153846 = 0.6502787724 x = 0.6502787724 Simplifying x = 0.6502787724

Subproblem 2

x + 0.3846153846 = -1.034894157 Simplifying x + 0.3846153846 = -1.034894157 Reorder the terms: 0.3846153846 + x = -1.034894157 Solving 0.3846153846 + x = -1.034894157 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3846153846' to each side of the equation. 0.3846153846 + -0.3846153846 + x = -1.034894157 + -0.3846153846 Combine like terms: 0.3846153846 + -0.3846153846 = 0.0000000000 0.0000000000 + x = -1.034894157 + -0.3846153846 x = -1.034894157 + -0.3846153846 Combine like terms: -1.034894157 + -0.3846153846 = -1.4195095416 x = -1.4195095416 Simplifying x = -1.4195095416

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.6502787724, -1.4195095416}

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