x(5x+1)=2x^2+4x+28

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Solution for x(5x+1)=2x^2+4x+28 equation:


Simplifying
x(5x + 1) = 2x2 + 4x + 28

Reorder the terms:
x(1 + 5x) = 2x2 + 4x + 28
(1 * x + 5x * x) = 2x2 + 4x + 28
(1x + 5x2) = 2x2 + 4x + 28

Reorder the terms:
1x + 5x2 = 28 + 4x + 2x2

Solving
1x + 5x2 = 28 + 4x + 2x2

Solving for variable 'x'.

Reorder the terms:
-28 + 1x + -4x + 5x2 + -2x2 = 28 + 4x + 2x2 + -28 + -4x + -2x2

Combine like terms: 1x + -4x = -3x
-28 + -3x + 5x2 + -2x2 = 28 + 4x + 2x2 + -28 + -4x + -2x2

Combine like terms: 5x2 + -2x2 = 3x2
-28 + -3x + 3x2 = 28 + 4x + 2x2 + -28 + -4x + -2x2

Reorder the terms:
-28 + -3x + 3x2 = 28 + -28 + 4x + -4x + 2x2 + -2x2

Combine like terms: 28 + -28 = 0
-28 + -3x + 3x2 = 0 + 4x + -4x + 2x2 + -2x2
-28 + -3x + 3x2 = 4x + -4x + 2x2 + -2x2

Combine like terms: 4x + -4x = 0
-28 + -3x + 3x2 = 0 + 2x2 + -2x2
-28 + -3x + 3x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
-28 + -3x + 3x2 = 0

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

Divide each side by '3'.
-9.333333333 + -1x + x2 = 0

Move the constant term to the right:

Add '9.333333333' to each side of the equation.
-9.333333333 + -1x + 9.333333333 + x2 = 0 + 9.333333333

Reorder the terms:
-9.333333333 + 9.333333333 + -1x + x2 = 0 + 9.333333333

Combine like terms: -9.333333333 + 9.333333333 = 0.000000000
0.000000000 + -1x + x2 = 0 + 9.333333333
-1x + x2 = 0 + 9.333333333

Combine like terms: 0 + 9.333333333 = 9.333333333
-1x + x2 = 9.333333333

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 9.333333333 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 9.333333333 + 0.25

Combine like terms: 9.333333333 + 0.25 = 9.583333333
0.25 + -1x + x2 = 9.583333333

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 9.583333333

Calculate the square root of the right side: 3.095695937

Break this problem into two subproblems by setting 
(x + -0.5) equal to 3.095695937 and -3.095695937.

Subproblem 1

x + -0.5 = 3.095695937 Simplifying x + -0.5 = 3.095695937 Reorder the terms: -0.5 + x = 3.095695937 Solving -0.5 + x = 3.095695937 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 3.095695937 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 3.095695937 + 0.5 x = 3.095695937 + 0.5 Combine like terms: 3.095695937 + 0.5 = 3.595695937 x = 3.595695937 Simplifying x = 3.595695937

Subproblem 2

x + -0.5 = -3.095695937 Simplifying x + -0.5 = -3.095695937 Reorder the terms: -0.5 + x = -3.095695937 Solving -0.5 + x = -3.095695937 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -3.095695937 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -3.095695937 + 0.5 x = -3.095695937 + 0.5 Combine like terms: -3.095695937 + 0.5 = -2.595695937 x = -2.595695937 Simplifying x = -2.595695937

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.595695937, -2.595695937}

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