8(1+5x)x+5=13+5x

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Solution for 8(1+5x)x+5=13+5x equation:


Simplifying
8(1 + 5x) * x + 5 = 13 + 5x

Reorder the terms for easier multiplication:
8x(1 + 5x) + 5 = 13 + 5x
(1 * 8x + 5x * 8x) + 5 = 13 + 5x
(8x + 40x2) + 5 = 13 + 5x

Reorder the terms:
5 + 8x + 40x2 = 13 + 5x

Solving
5 + 8x + 40x2 = 13 + 5x

Solving for variable 'x'.

Reorder the terms:
5 + -13 + 8x + -5x + 40x2 = 13 + 5x + -13 + -5x

Combine like terms: 5 + -13 = -8
-8 + 8x + -5x + 40x2 = 13 + 5x + -13 + -5x

Combine like terms: 8x + -5x = 3x
-8 + 3x + 40x2 = 13 + 5x + -13 + -5x

Reorder the terms:
-8 + 3x + 40x2 = 13 + -13 + 5x + -5x

Combine like terms: 13 + -13 = 0
-8 + 3x + 40x2 = 0 + 5x + -5x
-8 + 3x + 40x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
-8 + 3x + 40x2 = 0

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

Divide each side by '40'.
-0.2 + 0.075x + x2 = 0.0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + 0.075x + 0.2 + x2 = 0.0 + 0.2

Reorder the terms:
-0.2 + 0.2 + 0.075x + x2 = 0.0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + 0.075x + x2 = 0.0 + 0.2
0.075x + x2 = 0.0 + 0.2

Combine like terms: 0.0 + 0.2 = 0.2
0.075x + x2 = 0.2

The x term is 0.075x.  Take half its coefficient (0.0375).
Square it (0.00140625) and add it to both sides.

Add '0.00140625' to each side of the equation.
0.075x + 0.00140625 + x2 = 0.2 + 0.00140625

Reorder the terms:
0.00140625 + 0.075x + x2 = 0.2 + 0.00140625

Combine like terms: 0.2 + 0.00140625 = 0.20140625
0.00140625 + 0.075x + x2 = 0.20140625

Factor a perfect square on the left side:
(x + 0.0375)(x + 0.0375) = 0.20140625

Calculate the square root of the right side: 0.448783077

Break this problem into two subproblems by setting 
(x + 0.0375) equal to 0.448783077 and -0.448783077.

Subproblem 1

x + 0.0375 = 0.448783077 Simplifying x + 0.0375 = 0.448783077 Reorder the terms: 0.0375 + x = 0.448783077 Solving 0.0375 + x = 0.448783077 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0375' to each side of the equation. 0.0375 + -0.0375 + x = 0.448783077 + -0.0375 Combine like terms: 0.0375 + -0.0375 = 0.0000 0.0000 + x = 0.448783077 + -0.0375 x = 0.448783077 + -0.0375 Combine like terms: 0.448783077 + -0.0375 = 0.411283077 x = 0.411283077 Simplifying x = 0.411283077

Subproblem 2

x + 0.0375 = -0.448783077 Simplifying x + 0.0375 = -0.448783077 Reorder the terms: 0.0375 + x = -0.448783077 Solving 0.0375 + x = -0.448783077 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0375' to each side of the equation. 0.0375 + -0.0375 + x = -0.448783077 + -0.0375 Combine like terms: 0.0375 + -0.0375 = 0.0000 0.0000 + x = -0.448783077 + -0.0375 x = -0.448783077 + -0.0375 Combine like terms: -0.448783077 + -0.0375 = -0.486283077 x = -0.486283077 Simplifying x = -0.486283077

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.411283077, -0.486283077}

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