(x+5)(4x+3)=-3

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Solution for (x+5)(4x+3)=-3 equation:


Simplifying
(x + 5)(4x + 3) = -3

Reorder the terms:
(5 + x)(4x + 3) = -3

Reorder the terms:
(5 + x)(3 + 4x) = -3

Multiply (5 + x) * (3 + 4x)
(5(3 + 4x) + x(3 + 4x)) = -3
((3 * 5 + 4x * 5) + x(3 + 4x)) = -3
((15 + 20x) + x(3 + 4x)) = -3
(15 + 20x + (3 * x + 4x * x)) = -3
(15 + 20x + (3x + 4x2)) = -3

Combine like terms: 20x + 3x = 23x
(15 + 23x + 4x2) = -3

Solving
15 + 23x + 4x2 = -3

Solving for variable 'x'.

Reorder the terms:
15 + 3 + 23x + 4x2 = -3 + 3

Combine like terms: 15 + 3 = 18
18 + 23x + 4x2 = -3 + 3

Combine like terms: -3 + 3 = 0
18 + 23x + 4x2 = 0

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

Divide each side by '4'.
4.5 + 5.75x + x2 = 0

Move the constant term to the right:

Add '-4.5' to each side of the equation.
4.5 + 5.75x + -4.5 + x2 = 0 + -4.5

Reorder the terms:
4.5 + -4.5 + 5.75x + x2 = 0 + -4.5

Combine like terms: 4.5 + -4.5 = 0.0
0.0 + 5.75x + x2 = 0 + -4.5
5.75x + x2 = 0 + -4.5

Combine like terms: 0 + -4.5 = -4.5
5.75x + x2 = -4.5

The x term is 5.75x.  Take half its coefficient (2.875).
Square it (8.265625) and add it to both sides.

Add '8.265625' to each side of the equation.
5.75x + 8.265625 + x2 = -4.5 + 8.265625

Reorder the terms:
8.265625 + 5.75x + x2 = -4.5 + 8.265625

Combine like terms: -4.5 + 8.265625 = 3.765625
8.265625 + 5.75x + x2 = 3.765625

Factor a perfect square on the left side:
(x + 2.875)(x + 2.875) = 3.765625

Calculate the square root of the right side: 1.940521837

Break this problem into two subproblems by setting 
(x + 2.875) equal to 1.940521837 and -1.940521837.

Subproblem 1

x + 2.875 = 1.940521837 Simplifying x + 2.875 = 1.940521837 Reorder the terms: 2.875 + x = 1.940521837 Solving 2.875 + x = 1.940521837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.875' to each side of the equation. 2.875 + -2.875 + x = 1.940521837 + -2.875 Combine like terms: 2.875 + -2.875 = 0.000 0.000 + x = 1.940521837 + -2.875 x = 1.940521837 + -2.875 Combine like terms: 1.940521837 + -2.875 = -0.934478163 x = -0.934478163 Simplifying x = -0.934478163

Subproblem 2

x + 2.875 = -1.940521837 Simplifying x + 2.875 = -1.940521837 Reorder the terms: 2.875 + x = -1.940521837 Solving 2.875 + x = -1.940521837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.875' to each side of the equation. 2.875 + -2.875 + x = -1.940521837 + -2.875 Combine like terms: 2.875 + -2.875 = 0.000 0.000 + x = -1.940521837 + -2.875 x = -1.940521837 + -2.875 Combine like terms: -1.940521837 + -2.875 = -4.815521837 x = -4.815521837 Simplifying x = -4.815521837

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.934478163, -4.815521837}

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