(5x+1)(x+3)-8=5(x+5)

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


Simplifying
(5x + 1)(x + 3) + -8 = 5(x + 5)

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

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

Multiply (1 + 5x) * (3 + x)
(1(3 + x) + 5x * (3 + x)) + -8 = 5(x + 5)
((3 * 1 + x * 1) + 5x * (3 + x)) + -8 = 5(x + 5)
((3 + 1x) + 5x * (3 + x)) + -8 = 5(x + 5)
(3 + 1x + (3 * 5x + x * 5x)) + -8 = 5(x + 5)
(3 + 1x + (15x + 5x2)) + -8 = 5(x + 5)

Combine like terms: 1x + 15x = 16x
(3 + 16x + 5x2) + -8 = 5(x + 5)

Reorder the terms:
3 + -8 + 16x + 5x2 = 5(x + 5)

Combine like terms: 3 + -8 = -5
-5 + 16x + 5x2 = 5(x + 5)

Reorder the terms:
-5 + 16x + 5x2 = 5(5 + x)
-5 + 16x + 5x2 = (5 * 5 + x * 5)
-5 + 16x + 5x2 = (25 + 5x)

Solving
-5 + 16x + 5x2 = 25 + 5x

Solving for variable 'x'.

Reorder the terms:
-5 + -25 + 16x + -5x + 5x2 = 25 + 5x + -25 + -5x

Combine like terms: -5 + -25 = -30
-30 + 16x + -5x + 5x2 = 25 + 5x + -25 + -5x

Combine like terms: 16x + -5x = 11x
-30 + 11x + 5x2 = 25 + 5x + -25 + -5x

Reorder the terms:
-30 + 11x + 5x2 = 25 + -25 + 5x + -5x

Combine like terms: 25 + -25 = 0
-30 + 11x + 5x2 = 0 + 5x + -5x
-30 + 11x + 5x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
-30 + 11x + 5x2 = 0

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

Divide each side by '5'.
-6 + 2.2x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + 2.2x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + 2.2x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 2.2x + x2 = 0 + 6
2.2x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
2.2x + x2 = 6

The x term is 2.2x.  Take half its coefficient (1.1).
Square it (1.21) and add it to both sides.

Add '1.21' to each side of the equation.
2.2x + 1.21 + x2 = 6 + 1.21

Reorder the terms:
1.21 + 2.2x + x2 = 6 + 1.21

Combine like terms: 6 + 1.21 = 7.21
1.21 + 2.2x + x2 = 7.21

Factor a perfect square on the left side:
(x + 1.1)(x + 1.1) = 7.21

Calculate the square root of the right side: 2.685144316

Break this problem into two subproblems by setting 
(x + 1.1) equal to 2.685144316 and -2.685144316.

Subproblem 1

x + 1.1 = 2.685144316 Simplifying x + 1.1 = 2.685144316 Reorder the terms: 1.1 + x = 2.685144316 Solving 1.1 + x = 2.685144316 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.1' to each side of the equation. 1.1 + -1.1 + x = 2.685144316 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + x = 2.685144316 + -1.1 x = 2.685144316 + -1.1 Combine like terms: 2.685144316 + -1.1 = 1.585144316 x = 1.585144316 Simplifying x = 1.585144316

Subproblem 2

x + 1.1 = -2.685144316 Simplifying x + 1.1 = -2.685144316 Reorder the terms: 1.1 + x = -2.685144316 Solving 1.1 + x = -2.685144316 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.1' to each side of the equation. 1.1 + -1.1 + x = -2.685144316 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + x = -2.685144316 + -1.1 x = -2.685144316 + -1.1 Combine like terms: -2.685144316 + -1.1 = -3.785144316 x = -3.785144316 Simplifying x = -3.785144316

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.585144316, -3.785144316}

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