(4x-5)(2x+17)=360

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Solution for (4x-5)(2x+17)=360 equation:


Simplifying
(4x + -5)(2x + 17) = 360

Reorder the terms:
(-5 + 4x)(2x + 17) = 360

Reorder the terms:
(-5 + 4x)(17 + 2x) = 360

Multiply (-5 + 4x) * (17 + 2x)
(-5(17 + 2x) + 4x * (17 + 2x)) = 360
((17 * -5 + 2x * -5) + 4x * (17 + 2x)) = 360
((-85 + -10x) + 4x * (17 + 2x)) = 360
(-85 + -10x + (17 * 4x + 2x * 4x)) = 360
(-85 + -10x + (68x + 8x2)) = 360

Combine like terms: -10x + 68x = 58x
(-85 + 58x + 8x2) = 360

Solving
-85 + 58x + 8x2 = 360

Solving for variable 'x'.

Reorder the terms:
-85 + -360 + 58x + 8x2 = 360 + -360

Combine like terms: -85 + -360 = -445
-445 + 58x + 8x2 = 360 + -360

Combine like terms: 360 + -360 = 0
-445 + 58x + 8x2 = 0

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

Divide each side by '8'.
-55.625 + 7.25x + x2 = 0

Move the constant term to the right:

Add '55.625' to each side of the equation.
-55.625 + 7.25x + 55.625 + x2 = 0 + 55.625

Reorder the terms:
-55.625 + 55.625 + 7.25x + x2 = 0 + 55.625

Combine like terms: -55.625 + 55.625 = 0.000
0.000 + 7.25x + x2 = 0 + 55.625
7.25x + x2 = 0 + 55.625

Combine like terms: 0 + 55.625 = 55.625
7.25x + x2 = 55.625

The x term is 7.25x.  Take half its coefficient (3.625).
Square it (13.140625) and add it to both sides.

Add '13.140625' to each side of the equation.
7.25x + 13.140625 + x2 = 55.625 + 13.140625

Reorder the terms:
13.140625 + 7.25x + x2 = 55.625 + 13.140625

Combine like terms: 55.625 + 13.140625 = 68.765625
13.140625 + 7.25x + x2 = 68.765625

Factor a perfect square on the left side:
(x + 3.625)(x + 3.625) = 68.765625

Calculate the square root of the right side: 8.292504145

Break this problem into two subproblems by setting 
(x + 3.625) equal to 8.292504145 and -8.292504145.

Subproblem 1

x + 3.625 = 8.292504145 Simplifying x + 3.625 = 8.292504145 Reorder the terms: 3.625 + x = 8.292504145 Solving 3.625 + x = 8.292504145 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.625' to each side of the equation. 3.625 + -3.625 + x = 8.292504145 + -3.625 Combine like terms: 3.625 + -3.625 = 0.000 0.000 + x = 8.292504145 + -3.625 x = 8.292504145 + -3.625 Combine like terms: 8.292504145 + -3.625 = 4.667504145 x = 4.667504145 Simplifying x = 4.667504145

Subproblem 2

x + 3.625 = -8.292504145 Simplifying x + 3.625 = -8.292504145 Reorder the terms: 3.625 + x = -8.292504145 Solving 3.625 + x = -8.292504145 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.625' to each side of the equation. 3.625 + -3.625 + x = -8.292504145 + -3.625 Combine like terms: 3.625 + -3.625 = 0.000 0.000 + x = -8.292504145 + -3.625 x = -8.292504145 + -3.625 Combine like terms: -8.292504145 + -3.625 = -11.917504145 x = -11.917504145 Simplifying x = -11.917504145

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.667504145, -11.917504145}

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