x(5x+1)=4x-4x+28

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Solution for x(5x+1)=4x-4x+28 equation:


Simplifying
x(5x + 1) = 4x + -4x + 28

Reorder the terms:
x(1 + 5x) = 4x + -4x + 28
(1 * x + 5x * x) = 4x + -4x + 28
(1x + 5x2) = 4x + -4x + 28

Reorder the terms:
1x + 5x2 = 28 + 4x + -4x

Combine like terms: 4x + -4x = 0
1x + 5x2 = 28 + 0
1x + 5x2 = 28

Solving
1x + 5x2 = 28

Solving for variable 'x'.

Reorder the terms:
-28 + 1x + 5x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + 1x + 5x2 = 0

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

Divide each side by '5'.
-5.6 + 0.2x + x2 = 0

Move the constant term to the right:

Add '5.6' to each side of the equation.
-5.6 + 0.2x + 5.6 + x2 = 0 + 5.6

Reorder the terms:
-5.6 + 5.6 + 0.2x + x2 = 0 + 5.6

Combine like terms: -5.6 + 5.6 = 0.0
0.0 + 0.2x + x2 = 0 + 5.6
0.2x + x2 = 0 + 5.6

Combine like terms: 0 + 5.6 = 5.6
0.2x + x2 = 5.6

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 = 5.6 + 0.01

Reorder the terms:
0.01 + 0.2x + x2 = 5.6 + 0.01

Combine like terms: 5.6 + 0.01 = 5.61
0.01 + 0.2x + x2 = 5.61

Factor a perfect square on the left side:
(x + 0.1)(x + 0.1) = 5.61

Calculate the square root of the right side: 2.368543856

Break this problem into two subproblems by setting 
(x + 0.1) equal to 2.368543856 and -2.368543856.

Subproblem 1

x + 0.1 = 2.368543856 Simplifying x + 0.1 = 2.368543856 Reorder the terms: 0.1 + x = 2.368543856 Solving 0.1 + x = 2.368543856 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 = 2.368543856 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = 2.368543856 + -0.1 x = 2.368543856 + -0.1 Combine like terms: 2.368543856 + -0.1 = 2.268543856 x = 2.268543856 Simplifying x = 2.268543856

Subproblem 2

x + 0.1 = -2.368543856 Simplifying x + 0.1 = -2.368543856 Reorder the terms: 0.1 + x = -2.368543856 Solving 0.1 + x = -2.368543856 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 = -2.368543856 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = -2.368543856 + -0.1 x = -2.368543856 + -0.1 Combine like terms: -2.368543856 + -0.1 = -2.468543856 x = -2.468543856 Simplifying x = -2.468543856

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.268543856, -2.468543856}

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