(5x+3)(x-4)=2

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Solution for (5x+3)(x-4)=2 equation:


Simplifying
(5x + 3)(x + -4) = 2

Reorder the terms:
(3 + 5x)(x + -4) = 2

Reorder the terms:
(3 + 5x)(-4 + x) = 2

Multiply (3 + 5x) * (-4 + x)
(3(-4 + x) + 5x * (-4 + x)) = 2
((-4 * 3 + x * 3) + 5x * (-4 + x)) = 2
((-12 + 3x) + 5x * (-4 + x)) = 2
(-12 + 3x + (-4 * 5x + x * 5x)) = 2
(-12 + 3x + (-20x + 5x2)) = 2

Combine like terms: 3x + -20x = -17x
(-12 + -17x + 5x2) = 2

Solving
-12 + -17x + 5x2 = 2

Solving for variable 'x'.

Reorder the terms:
-12 + -2 + -17x + 5x2 = 2 + -2

Combine like terms: -12 + -2 = -14
-14 + -17x + 5x2 = 2 + -2

Combine like terms: 2 + -2 = 0
-14 + -17x + 5x2 = 0

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

Divide each side by '5'.
-2.8 + -3.4x + x2 = 0

Move the constant term to the right:

Add '2.8' to each side of the equation.
-2.8 + -3.4x + 2.8 + x2 = 0 + 2.8

Reorder the terms:
-2.8 + 2.8 + -3.4x + x2 = 0 + 2.8

Combine like terms: -2.8 + 2.8 = 0.0
0.0 + -3.4x + x2 = 0 + 2.8
-3.4x + x2 = 0 + 2.8

Combine like terms: 0 + 2.8 = 2.8
-3.4x + x2 = 2.8

The x term is -3.4x.  Take half its coefficient (-1.7).
Square it (2.89) and add it to both sides.

Add '2.89' to each side of the equation.
-3.4x + 2.89 + x2 = 2.8 + 2.89

Reorder the terms:
2.89 + -3.4x + x2 = 2.8 + 2.89

Combine like terms: 2.8 + 2.89 = 5.69
2.89 + -3.4x + x2 = 5.69

Factor a perfect square on the left side:
(x + -1.7)(x + -1.7) = 5.69

Calculate the square root of the right side: 2.385372088

Break this problem into two subproblems by setting 
(x + -1.7) equal to 2.385372088 and -2.385372088.

Subproblem 1

x + -1.7 = 2.385372088 Simplifying x + -1.7 = 2.385372088 Reorder the terms: -1.7 + x = 2.385372088 Solving -1.7 + x = 2.385372088 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.7' to each side of the equation. -1.7 + 1.7 + x = 2.385372088 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + x = 2.385372088 + 1.7 x = 2.385372088 + 1.7 Combine like terms: 2.385372088 + 1.7 = 4.085372088 x = 4.085372088 Simplifying x = 4.085372088

Subproblem 2

x + -1.7 = -2.385372088 Simplifying x + -1.7 = -2.385372088 Reorder the terms: -1.7 + x = -2.385372088 Solving -1.7 + x = -2.385372088 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.7' to each side of the equation. -1.7 + 1.7 + x = -2.385372088 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + x = -2.385372088 + 1.7 x = -2.385372088 + 1.7 Combine like terms: -2.385372088 + 1.7 = -0.685372088 x = -0.685372088 Simplifying x = -0.685372088

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.085372088, -0.685372088}

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