(5x+2)(x+1)=1

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Solution for (5x+2)(x+1)=1 equation:


Simplifying
(5x + 2)(x + 1) = 1

Reorder the terms:
(2 + 5x)(x + 1) = 1

Reorder the terms:
(2 + 5x)(1 + x) = 1

Multiply (2 + 5x) * (1 + x)
(2(1 + x) + 5x * (1 + x)) = 1
((1 * 2 + x * 2) + 5x * (1 + x)) = 1
((2 + 2x) + 5x * (1 + x)) = 1
(2 + 2x + (1 * 5x + x * 5x)) = 1
(2 + 2x + (5x + 5x2)) = 1

Combine like terms: 2x + 5x = 7x
(2 + 7x + 5x2) = 1

Solving
2 + 7x + 5x2 = 1

Solving for variable 'x'.

Reorder the terms:
2 + -1 + 7x + 5x2 = 1 + -1

Combine like terms: 2 + -1 = 1
1 + 7x + 5x2 = 1 + -1

Combine like terms: 1 + -1 = 0
1 + 7x + 5x2 = 0

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

Divide each side by '5'.
0.2 + 1.4x + x2 = 0

Move the constant term to the right:

Add '-0.2' to each side of the equation.
0.2 + 1.4x + -0.2 + x2 = 0 + -0.2

Reorder the terms:
0.2 + -0.2 + 1.4x + x2 = 0 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
0.0 + 1.4x + x2 = 0 + -0.2
1.4x + x2 = 0 + -0.2

Combine like terms: 0 + -0.2 = -0.2
1.4x + x2 = -0.2

The x term is 1.4x.  Take half its coefficient (0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
1.4x + 0.49 + x2 = -0.2 + 0.49

Reorder the terms:
0.49 + 1.4x + x2 = -0.2 + 0.49

Combine like terms: -0.2 + 0.49 = 0.29
0.49 + 1.4x + x2 = 0.29

Factor a perfect square on the left side:
(x + 0.7)(x + 0.7) = 0.29

Calculate the square root of the right side: 0.538516481

Break this problem into two subproblems by setting 
(x + 0.7) equal to 0.538516481 and -0.538516481.

Subproblem 1

x + 0.7 = 0.538516481 Simplifying x + 0.7 = 0.538516481 Reorder the terms: 0.7 + x = 0.538516481 Solving 0.7 + x = 0.538516481 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7' to each side of the equation. 0.7 + -0.7 + x = 0.538516481 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + x = 0.538516481 + -0.7 x = 0.538516481 + -0.7 Combine like terms: 0.538516481 + -0.7 = -0.161483519 x = -0.161483519 Simplifying x = -0.161483519

Subproblem 2

x + 0.7 = -0.538516481 Simplifying x + 0.7 = -0.538516481 Reorder the terms: 0.7 + x = -0.538516481 Solving 0.7 + x = -0.538516481 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7' to each side of the equation. 0.7 + -0.7 + x = -0.538516481 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + x = -0.538516481 + -0.7 x = -0.538516481 + -0.7 Combine like terms: -0.538516481 + -0.7 = -1.238516481 x = -1.238516481 Simplifying x = -1.238516481

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.161483519, -1.238516481}

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