(2x-5)(3x+2)-(x^2-3x-8)=

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Solution for (2x-5)(3x+2)-(x^2-3x-8)= equation:


Simplifying
(2x + -5)(3x + 2) + -1(x2 + -3x + -8) = 0

Reorder the terms:
(-5 + 2x)(3x + 2) + -1(x2 + -3x + -8) = 0

Reorder the terms:
(-5 + 2x)(2 + 3x) + -1(x2 + -3x + -8) = 0

Multiply (-5 + 2x) * (2 + 3x)
(-5(2 + 3x) + 2x * (2 + 3x)) + -1(x2 + -3x + -8) = 0
((2 * -5 + 3x * -5) + 2x * (2 + 3x)) + -1(x2 + -3x + -8) = 0
((-10 + -15x) + 2x * (2 + 3x)) + -1(x2 + -3x + -8) = 0
(-10 + -15x + (2 * 2x + 3x * 2x)) + -1(x2 + -3x + -8) = 0
(-10 + -15x + (4x + 6x2)) + -1(x2 + -3x + -8) = 0

Combine like terms: -15x + 4x = -11x
(-10 + -11x + 6x2) + -1(x2 + -3x + -8) = 0

Reorder the terms:
-10 + -11x + 6x2 + -1(-8 + -3x + x2) = 0
-10 + -11x + 6x2 + (-8 * -1 + -3x * -1 + x2 * -1) = 0
-10 + -11x + 6x2 + (8 + 3x + -1x2) = 0

Reorder the terms:
-10 + 8 + -11x + 3x + 6x2 + -1x2 = 0

Combine like terms: -10 + 8 = -2
-2 + -11x + 3x + 6x2 + -1x2 = 0

Combine like terms: -11x + 3x = -8x
-2 + -8x + 6x2 + -1x2 = 0

Combine like terms: 6x2 + -1x2 = 5x2
-2 + -8x + 5x2 = 0

Solving
-2 + -8x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-0.4 + -1.6x + x2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + -1.6x + 0.4 + x2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + -1.6x + x2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + -1.6x + x2 = 0 + 0.4
-1.6x + x2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
-1.6x + x2 = 0.4

The x term is -1.6x.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6x + 0.64 + x2 = 0.4 + 0.64

Reorder the terms:
0.64 + -1.6x + x2 = 0.4 + 0.64

Combine like terms: 0.4 + 0.64 = 1.04
0.64 + -1.6x + x2 = 1.04

Factor a perfect square on the left side:
(x + -0.8)(x + -0.8) = 1.04

Calculate the square root of the right side: 1.019803903

Break this problem into two subproblems by setting 
(x + -0.8) equal to 1.019803903 and -1.019803903.

Subproblem 1

x + -0.8 = 1.019803903 Simplifying x + -0.8 = 1.019803903 Reorder the terms: -0.8 + x = 1.019803903 Solving -0.8 + x = 1.019803903 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = 1.019803903 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = 1.019803903 + 0.8 x = 1.019803903 + 0.8 Combine like terms: 1.019803903 + 0.8 = 1.819803903 x = 1.819803903 Simplifying x = 1.819803903

Subproblem 2

x + -0.8 = -1.019803903 Simplifying x + -0.8 = -1.019803903 Reorder the terms: -0.8 + x = -1.019803903 Solving -0.8 + x = -1.019803903 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = -1.019803903 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = -1.019803903 + 0.8 x = -1.019803903 + 0.8 Combine like terms: -1.019803903 + 0.8 = -0.219803903 x = -0.219803903 Simplifying x = -0.219803903

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.819803903, -0.219803903}

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