(4x+3)(x+1)=1

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Solution for (4x+3)(x+1)=1 equation:


Simplifying
(4x + 3)(x + 1) = 1

Reorder the terms:
(3 + 4x)(x + 1) = 1

Reorder the terms:
(3 + 4x)(1 + x) = 1

Multiply (3 + 4x) * (1 + x)
(3(1 + x) + 4x * (1 + x)) = 1
((1 * 3 + x * 3) + 4x * (1 + x)) = 1
((3 + 3x) + 4x * (1 + x)) = 1
(3 + 3x + (1 * 4x + x * 4x)) = 1
(3 + 3x + (4x + 4x2)) = 1

Combine like terms: 3x + 4x = 7x
(3 + 7x + 4x2) = 1

Solving
3 + 7x + 4x2 = 1

Solving for variable 'x'.

Reorder the terms:
3 + -1 + 7x + 4x2 = 1 + -1

Combine like terms: 3 + -1 = 2
2 + 7x + 4x2 = 1 + -1

Combine like terms: 1 + -1 = 0
2 + 7x + 4x2 = 0

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

Divide each side by '4'.
0.5 + 1.75x + x2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + 1.75x + -0.5 + x2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + 1.75x + x2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + 1.75x + x2 = 0 + -0.5
1.75x + x2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
1.75x + x2 = -0.5

The x term is 1.75x.  Take half its coefficient (0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
1.75x + 0.765625 + x2 = -0.5 + 0.765625

Reorder the terms:
0.765625 + 1.75x + x2 = -0.5 + 0.765625

Combine like terms: -0.5 + 0.765625 = 0.265625
0.765625 + 1.75x + x2 = 0.265625

Factor a perfect square on the left side:
(x + 0.875)(x + 0.875) = 0.265625

Calculate the square root of the right side: 0.515388203

Break this problem into two subproblems by setting 
(x + 0.875) equal to 0.515388203 and -0.515388203.

Subproblem 1

x + 0.875 = 0.515388203 Simplifying x + 0.875 = 0.515388203 Reorder the terms: 0.875 + x = 0.515388203 Solving 0.875 + x = 0.515388203 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = 0.515388203 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = 0.515388203 + -0.875 x = 0.515388203 + -0.875 Combine like terms: 0.515388203 + -0.875 = -0.359611797 x = -0.359611797 Simplifying x = -0.359611797

Subproblem 2

x + 0.875 = -0.515388203 Simplifying x + 0.875 = -0.515388203 Reorder the terms: 0.875 + x = -0.515388203 Solving 0.875 + x = -0.515388203 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = -0.515388203 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = -0.515388203 + -0.875 x = -0.515388203 + -0.875 Combine like terms: -0.515388203 + -0.875 = -1.390388203 x = -1.390388203 Simplifying x = -1.390388203

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.359611797, -1.390388203}

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