(3x+1)(4x-3)-(15x+5x+8)=0

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Solution for (3x+1)(4x-3)-(15x+5x+8)=0 equation:


Simplifying
(3x + 1)(4x + -3) + -1(15x + 5x + 8) = 0

Reorder the terms:
(1 + 3x)(4x + -3) + -1(15x + 5x + 8) = 0

Reorder the terms:
(1 + 3x)(-3 + 4x) + -1(15x + 5x + 8) = 0

Multiply (1 + 3x) * (-3 + 4x)
(1(-3 + 4x) + 3x * (-3 + 4x)) + -1(15x + 5x + 8) = 0
((-3 * 1 + 4x * 1) + 3x * (-3 + 4x)) + -1(15x + 5x + 8) = 0
((-3 + 4x) + 3x * (-3 + 4x)) + -1(15x + 5x + 8) = 0
(-3 + 4x + (-3 * 3x + 4x * 3x)) + -1(15x + 5x + 8) = 0
(-3 + 4x + (-9x + 12x2)) + -1(15x + 5x + 8) = 0

Combine like terms: 4x + -9x = -5x
(-3 + -5x + 12x2) + -1(15x + 5x + 8) = 0

Reorder the terms:
-3 + -5x + 12x2 + -1(8 + 15x + 5x) = 0

Combine like terms: 15x + 5x = 20x
-3 + -5x + 12x2 + -1(8 + 20x) = 0
-3 + -5x + 12x2 + (8 * -1 + 20x * -1) = 0
-3 + -5x + 12x2 + (-8 + -20x) = 0

Reorder the terms:
-3 + -8 + -5x + -20x + 12x2 = 0

Combine like terms: -3 + -8 = -11
-11 + -5x + -20x + 12x2 = 0

Combine like terms: -5x + -20x = -25x
-11 + -25x + 12x2 = 0

Solving
-11 + -25x + 12x2 = 0

Solving for variable 'x'.

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

Divide each side by '12'.
-0.9166666667 + -2.083333333x + x2 = 0

Move the constant term to the right:

Add '0.9166666667' to each side of the equation.
-0.9166666667 + -2.083333333x + 0.9166666667 + x2 = 0 + 0.9166666667

Reorder the terms:
-0.9166666667 + 0.9166666667 + -2.083333333x + x2 = 0 + 0.9166666667

Combine like terms: -0.9166666667 + 0.9166666667 = 0.0000000000
0.0000000000 + -2.083333333x + x2 = 0 + 0.9166666667
-2.083333333x + x2 = 0 + 0.9166666667

Combine like terms: 0 + 0.9166666667 = 0.9166666667
-2.083333333x + x2 = 0.9166666667

The x term is -2.083333333x.  Take half its coefficient (-1.041666667).
Square it (1.085069445) and add it to both sides.

Add '1.085069445' to each side of the equation.
-2.083333333x + 1.085069445 + x2 = 0.9166666667 + 1.085069445

Reorder the terms:
1.085069445 + -2.083333333x + x2 = 0.9166666667 + 1.085069445

Combine like terms: 0.9166666667 + 1.085069445 = 2.0017361117
1.085069445 + -2.083333333x + x2 = 2.0017361117

Factor a perfect square on the left side:
(x + -1.041666667)(x + -1.041666667) = 2.0017361117

Calculate the square root of the right side: 1.414827237

Break this problem into two subproblems by setting 
(x + -1.041666667) equal to 1.414827237 and -1.414827237.

Subproblem 1

x + -1.041666667 = 1.414827237 Simplifying x + -1.041666667 = 1.414827237 Reorder the terms: -1.041666667 + x = 1.414827237 Solving -1.041666667 + x = 1.414827237 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.041666667' to each side of the equation. -1.041666667 + 1.041666667 + x = 1.414827237 + 1.041666667 Combine like terms: -1.041666667 + 1.041666667 = 0.000000000 0.000000000 + x = 1.414827237 + 1.041666667 x = 1.414827237 + 1.041666667 Combine like terms: 1.414827237 + 1.041666667 = 2.456493904 x = 2.456493904 Simplifying x = 2.456493904

Subproblem 2

x + -1.041666667 = -1.414827237 Simplifying x + -1.041666667 = -1.414827237 Reorder the terms: -1.041666667 + x = -1.414827237 Solving -1.041666667 + x = -1.414827237 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.041666667' to each side of the equation. -1.041666667 + 1.041666667 + x = -1.414827237 + 1.041666667 Combine like terms: -1.041666667 + 1.041666667 = 0.000000000 0.000000000 + x = -1.414827237 + 1.041666667 x = -1.414827237 + 1.041666667 Combine like terms: -1.414827237 + 1.041666667 = -0.37316057 x = -0.37316057 Simplifying x = -0.37316057

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.456493904, -0.37316057}

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