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

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


Simplifying
(5x + 2)(x + -2) = 8

Reorder the terms:
(2 + 5x)(x + -2) = 8

Reorder the terms:
(2 + 5x)(-2 + x) = 8

Multiply (2 + 5x) * (-2 + x)
(2(-2 + x) + 5x * (-2 + x)) = 8
((-2 * 2 + x * 2) + 5x * (-2 + x)) = 8
((-4 + 2x) + 5x * (-2 + x)) = 8
(-4 + 2x + (-2 * 5x + x * 5x)) = 8
(-4 + 2x + (-10x + 5x2)) = 8

Combine like terms: 2x + -10x = -8x
(-4 + -8x + 5x2) = 8

Solving
-4 + -8x + 5x2 = 8

Solving for variable 'x'.

Reorder the terms:
-4 + -8 + -8x + 5x2 = 8 + -8

Combine like terms: -4 + -8 = -12
-12 + -8x + 5x2 = 8 + -8

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

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

Divide each side by '5'.
-2.4 + -1.6x + x2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + -1.6x + 2.4 + x2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + -1.6x + x2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + -1.6x + x2 = 0 + 2.4
-1.6x + x2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
-1.6x + x2 = 2.4

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 = 2.4 + 0.64

Reorder the terms:
0.64 + -1.6x + x2 = 2.4 + 0.64

Combine like terms: 2.4 + 0.64 = 3.04
0.64 + -1.6x + x2 = 3.04

Factor a perfect square on the left side:
(x + -0.8)(x + -0.8) = 3.04

Calculate the square root of the right side: 1.743559577

Break this problem into two subproblems by setting 
(x + -0.8) equal to 1.743559577 and -1.743559577.

Subproblem 1

x + -0.8 = 1.743559577 Simplifying x + -0.8 = 1.743559577 Reorder the terms: -0.8 + x = 1.743559577 Solving -0.8 + x = 1.743559577 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 = 1.743559577 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = 1.743559577 + 0.8 x = 1.743559577 + 0.8 Combine like terms: 1.743559577 + 0.8 = 2.543559577 x = 2.543559577 Simplifying x = 2.543559577

Subproblem 2

x + -0.8 = -1.743559577 Simplifying x + -0.8 = -1.743559577 Reorder the terms: -0.8 + x = -1.743559577 Solving -0.8 + x = -1.743559577 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 = -1.743559577 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = -1.743559577 + 0.8 x = -1.743559577 + 0.8 Combine like terms: -1.743559577 + 0.8 = -0.943559577 x = -0.943559577 Simplifying x = -0.943559577

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.543559577, -0.943559577}

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