(8x+3)(5x+8)=180

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Solution for (8x+3)(5x+8)=180 equation:


Simplifying
(8x + 3)(5x + 8) = 180

Reorder the terms:
(3 + 8x)(5x + 8) = 180

Reorder the terms:
(3 + 8x)(8 + 5x) = 180

Multiply (3 + 8x) * (8 + 5x)
(3(8 + 5x) + 8x * (8 + 5x)) = 180
((8 * 3 + 5x * 3) + 8x * (8 + 5x)) = 180
((24 + 15x) + 8x * (8 + 5x)) = 180
(24 + 15x + (8 * 8x + 5x * 8x)) = 180
(24 + 15x + (64x + 40x2)) = 180

Combine like terms: 15x + 64x = 79x
(24 + 79x + 40x2) = 180

Solving
24 + 79x + 40x2 = 180

Solving for variable 'x'.

Reorder the terms:
24 + -180 + 79x + 40x2 = 180 + -180

Combine like terms: 24 + -180 = -156
-156 + 79x + 40x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-156 + 79x + 40x2 = 0

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

Divide each side by '40'.
-3.9 + 1.975x + x2 = 0.0

Move the constant term to the right:

Add '3.9' to each side of the equation.
-3.9 + 1.975x + 3.9 + x2 = 0.0 + 3.9

Reorder the terms:
-3.9 + 3.9 + 1.975x + x2 = 0.0 + 3.9

Combine like terms: -3.9 + 3.9 = 0.0
0.0 + 1.975x + x2 = 0.0 + 3.9
1.975x + x2 = 0.0 + 3.9

Combine like terms: 0.0 + 3.9 = 3.9
1.975x + x2 = 3.9

The x term is 1.975x.  Take half its coefficient (0.9875).
Square it (0.97515625) and add it to both sides.

Add '0.97515625' to each side of the equation.
1.975x + 0.97515625 + x2 = 3.9 + 0.97515625

Reorder the terms:
0.97515625 + 1.975x + x2 = 3.9 + 0.97515625

Combine like terms: 3.9 + 0.97515625 = 4.87515625
0.97515625 + 1.975x + x2 = 4.87515625

Factor a perfect square on the left side:
(x + 0.9875)(x + 0.9875) = 4.87515625

Calculate the square root of the right side: 2.2079756

Break this problem into two subproblems by setting 
(x + 0.9875) equal to 2.2079756 and -2.2079756.

Subproblem 1

x + 0.9875 = 2.2079756 Simplifying x + 0.9875 = 2.2079756 Reorder the terms: 0.9875 + x = 2.2079756 Solving 0.9875 + x = 2.2079756 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9875' to each side of the equation. 0.9875 + -0.9875 + x = 2.2079756 + -0.9875 Combine like terms: 0.9875 + -0.9875 = 0.0000 0.0000 + x = 2.2079756 + -0.9875 x = 2.2079756 + -0.9875 Combine like terms: 2.2079756 + -0.9875 = 1.2204756 x = 1.2204756 Simplifying x = 1.2204756

Subproblem 2

x + 0.9875 = -2.2079756 Simplifying x + 0.9875 = -2.2079756 Reorder the terms: 0.9875 + x = -2.2079756 Solving 0.9875 + x = -2.2079756 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9875' to each side of the equation. 0.9875 + -0.9875 + x = -2.2079756 + -0.9875 Combine like terms: 0.9875 + -0.9875 = 0.0000 0.0000 + x = -2.2079756 + -0.9875 x = -2.2079756 + -0.9875 Combine like terms: -2.2079756 + -0.9875 = -3.1954756 x = -3.1954756 Simplifying x = -3.1954756

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2204756, -3.1954756}

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