5x(x+1)=4(x+8)

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Solution for 5x(x+1)=4(x+8) equation:


Simplifying
5x(x + 1) = 4(x + 8)

Reorder the terms:
5x(1 + x) = 4(x + 8)
(1 * 5x + x * 5x) = 4(x + 8)
(5x + 5x2) = 4(x + 8)

Reorder the terms:
5x + 5x2 = 4(8 + x)
5x + 5x2 = (8 * 4 + x * 4)
5x + 5x2 = (32 + 4x)

Solving
5x + 5x2 = 32 + 4x

Solving for variable 'x'.

Reorder the terms:
-32 + 5x + -4x + 5x2 = 32 + 4x + -32 + -4x

Combine like terms: 5x + -4x = 1x
-32 + 1x + 5x2 = 32 + 4x + -32 + -4x

Reorder the terms:
-32 + 1x + 5x2 = 32 + -32 + 4x + -4x

Combine like terms: 32 + -32 = 0
-32 + 1x + 5x2 = 0 + 4x + -4x
-32 + 1x + 5x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
-32 + 1x + 5x2 = 0

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

Divide each side by '5'.
-6.4 + 0.2x + x2 = 0

Move the constant term to the right:

Add '6.4' to each side of the equation.
-6.4 + 0.2x + 6.4 + x2 = 0 + 6.4

Reorder the terms:
-6.4 + 6.4 + 0.2x + x2 = 0 + 6.4

Combine like terms: -6.4 + 6.4 = 0.0
0.0 + 0.2x + x2 = 0 + 6.4
0.2x + x2 = 0 + 6.4

Combine like terms: 0 + 6.4 = 6.4
0.2x + x2 = 6.4

The x term is 0.2x.  Take half its coefficient (0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
0.2x + 0.01 + x2 = 6.4 + 0.01

Reorder the terms:
0.01 + 0.2x + x2 = 6.4 + 0.01

Combine like terms: 6.4 + 0.01 = 6.41
0.01 + 0.2x + x2 = 6.41

Factor a perfect square on the left side:
(x + 0.1)(x + 0.1) = 6.41

Calculate the square root of the right side: 2.53179778

Break this problem into two subproblems by setting 
(x + 0.1) equal to 2.53179778 and -2.53179778.

Subproblem 1

x + 0.1 = 2.53179778 Simplifying x + 0.1 = 2.53179778 Reorder the terms: 0.1 + x = 2.53179778 Solving 0.1 + x = 2.53179778 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = 2.53179778 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = 2.53179778 + -0.1 x = 2.53179778 + -0.1 Combine like terms: 2.53179778 + -0.1 = 2.43179778 x = 2.43179778 Simplifying x = 2.43179778

Subproblem 2

x + 0.1 = -2.53179778 Simplifying x + 0.1 = -2.53179778 Reorder the terms: 0.1 + x = -2.53179778 Solving 0.1 + x = -2.53179778 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = -2.53179778 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = -2.53179778 + -0.1 x = -2.53179778 + -0.1 Combine like terms: -2.53179778 + -0.1 = -2.63179778 x = -2.63179778 Simplifying x = -2.63179778

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.43179778, -2.63179778}

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