(3x-8)(x+1)=2

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Solution for (3x-8)(x+1)=2 equation:


Simplifying
(3x + -8)(x + 1) = 2

Reorder the terms:
(-8 + 3x)(x + 1) = 2

Reorder the terms:
(-8 + 3x)(1 + x) = 2

Multiply (-8 + 3x) * (1 + x)
(-8(1 + x) + 3x * (1 + x)) = 2
((1 * -8 + x * -8) + 3x * (1 + x)) = 2
((-8 + -8x) + 3x * (1 + x)) = 2
(-8 + -8x + (1 * 3x + x * 3x)) = 2
(-8 + -8x + (3x + 3x2)) = 2

Combine like terms: -8x + 3x = -5x
(-8 + -5x + 3x2) = 2

Solving
-8 + -5x + 3x2 = 2

Solving for variable 'x'.

Reorder the terms:
-8 + -2 + -5x + 3x2 = 2 + -2

Combine like terms: -8 + -2 = -10
-10 + -5x + 3x2 = 2 + -2

Combine like terms: 2 + -2 = 0
-10 + -5x + 3x2 = 0

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

Divide each side by '3'.
-3.333333333 + -1.666666667x + x2 = 0

Move the constant term to the right:

Add '3.333333333' to each side of the equation.
-3.333333333 + -1.666666667x + 3.333333333 + x2 = 0 + 3.333333333

Reorder the terms:
-3.333333333 + 3.333333333 + -1.666666667x + x2 = 0 + 3.333333333

Combine like terms: -3.333333333 + 3.333333333 = 0.000000000
0.000000000 + -1.666666667x + x2 = 0 + 3.333333333
-1.666666667x + x2 = 0 + 3.333333333

Combine like terms: 0 + 3.333333333 = 3.333333333
-1.666666667x + x2 = 3.333333333

The x term is -1.666666667x.  Take half its coefficient (-0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
-1.666666667x + 0.6944444447 + x2 = 3.333333333 + 0.6944444447

Reorder the terms:
0.6944444447 + -1.666666667x + x2 = 3.333333333 + 0.6944444447

Combine like terms: 3.333333333 + 0.6944444447 = 4.0277777777
0.6944444447 + -1.666666667x + x2 = 4.0277777777

Factor a perfect square on the left side:
(x + -0.8333333335)(x + -0.8333333335) = 4.0277777777

Calculate the square root of the right side: 2.00693243

Break this problem into two subproblems by setting 
(x + -0.8333333335) equal to 2.00693243 and -2.00693243.

Subproblem 1

x + -0.8333333335 = 2.00693243 Simplifying x + -0.8333333335 = 2.00693243 Reorder the terms: -0.8333333335 + x = 2.00693243 Solving -0.8333333335 + x = 2.00693243 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + x = 2.00693243 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + x = 2.00693243 + 0.8333333335 x = 2.00693243 + 0.8333333335 Combine like terms: 2.00693243 + 0.8333333335 = 2.8402657635 x = 2.8402657635 Simplifying x = 2.8402657635

Subproblem 2

x + -0.8333333335 = -2.00693243 Simplifying x + -0.8333333335 = -2.00693243 Reorder the terms: -0.8333333335 + x = -2.00693243 Solving -0.8333333335 + x = -2.00693243 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + x = -2.00693243 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + x = -2.00693243 + 0.8333333335 x = -2.00693243 + 0.8333333335 Combine like terms: -2.00693243 + 0.8333333335 = -1.1735990965 x = -1.1735990965 Simplifying x = -1.1735990965

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.8402657635, -1.1735990965}

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