(5x+3)(4x+1)=103

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Solution for (5x+3)(4x+1)=103 equation:


Simplifying
(5x + 3)(4x + 1) = 103

Reorder the terms:
(3 + 5x)(4x + 1) = 103

Reorder the terms:
(3 + 5x)(1 + 4x) = 103

Multiply (3 + 5x) * (1 + 4x)
(3(1 + 4x) + 5x * (1 + 4x)) = 103
((1 * 3 + 4x * 3) + 5x * (1 + 4x)) = 103
((3 + 12x) + 5x * (1 + 4x)) = 103
(3 + 12x + (1 * 5x + 4x * 5x)) = 103
(3 + 12x + (5x + 20x2)) = 103

Combine like terms: 12x + 5x = 17x
(3 + 17x + 20x2) = 103

Solving
3 + 17x + 20x2 = 103

Solving for variable 'x'.

Reorder the terms:
3 + -103 + 17x + 20x2 = 103 + -103

Combine like terms: 3 + -103 = -100
-100 + 17x + 20x2 = 103 + -103

Combine like terms: 103 + -103 = 0
-100 + 17x + 20x2 = 0

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

Divide each side by '20'.
-5 + 0.85x + x2 = 0.0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 0.85x + 5 + x2 = 0.0 + 5

Reorder the terms:
-5 + 5 + 0.85x + x2 = 0.0 + 5

Combine like terms: -5 + 5 = 0
0 + 0.85x + x2 = 0.0 + 5
0.85x + x2 = 0.0 + 5

Combine like terms: 0.0 + 5 = 5
0.85x + x2 = 5

The x term is 0.85x.  Take half its coefficient (0.425).
Square it (0.180625) and add it to both sides.

Add '0.180625' to each side of the equation.
0.85x + 0.180625 + x2 = 5 + 0.180625

Reorder the terms:
0.180625 + 0.85x + x2 = 5 + 0.180625

Combine like terms: 5 + 0.180625 = 5.180625
0.180625 + 0.85x + x2 = 5.180625

Factor a perfect square on the left side:
(x + 0.425)(x + 0.425) = 5.180625

Calculate the square root of the right side: 2.276098636

Break this problem into two subproblems by setting 
(x + 0.425) equal to 2.276098636 and -2.276098636.

Subproblem 1

x + 0.425 = 2.276098636 Simplifying x + 0.425 = 2.276098636 Reorder the terms: 0.425 + x = 2.276098636 Solving 0.425 + x = 2.276098636 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.425' to each side of the equation. 0.425 + -0.425 + x = 2.276098636 + -0.425 Combine like terms: 0.425 + -0.425 = 0.000 0.000 + x = 2.276098636 + -0.425 x = 2.276098636 + -0.425 Combine like terms: 2.276098636 + -0.425 = 1.851098636 x = 1.851098636 Simplifying x = 1.851098636

Subproblem 2

x + 0.425 = -2.276098636 Simplifying x + 0.425 = -2.276098636 Reorder the terms: 0.425 + x = -2.276098636 Solving 0.425 + x = -2.276098636 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.425' to each side of the equation. 0.425 + -0.425 + x = -2.276098636 + -0.425 Combine like terms: 0.425 + -0.425 = 0.000 0.000 + x = -2.276098636 + -0.425 x = -2.276098636 + -0.425 Combine like terms: -2.276098636 + -0.425 = -2.701098636 x = -2.701098636 Simplifying x = -2.701098636

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.851098636, -2.701098636}

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