5x(x+2)=8+4(5-x)

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Solution for 5x(x+2)=8+4(5-x) equation:


Simplifying
5x(x + 2) = 8 + 4(5 + -1x)

Reorder the terms:
5x(2 + x) = 8 + 4(5 + -1x)
(2 * 5x + x * 5x) = 8 + 4(5 + -1x)
(10x + 5x2) = 8 + 4(5 + -1x)
10x + 5x2 = 8 + (5 * 4 + -1x * 4)
10x + 5x2 = 8 + (20 + -4x)

Combine like terms: 8 + 20 = 28
10x + 5x2 = 28 + -4x

Solving
10x + 5x2 = 28 + -4x

Solving for variable 'x'.

Reorder the terms:
-28 + 10x + 4x + 5x2 = 28 + -4x + -28 + 4x

Combine like terms: 10x + 4x = 14x
-28 + 14x + 5x2 = 28 + -4x + -28 + 4x

Reorder the terms:
-28 + 14x + 5x2 = 28 + -28 + -4x + 4x

Combine like terms: 28 + -28 = 0
-28 + 14x + 5x2 = 0 + -4x + 4x
-28 + 14x + 5x2 = -4x + 4x

Combine like terms: -4x + 4x = 0
-28 + 14x + 5x2 = 0

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

Divide each side by '5'.
-5.6 + 2.8x + x2 = 0

Move the constant term to the right:

Add '5.6' to each side of the equation.
-5.6 + 2.8x + 5.6 + x2 = 0 + 5.6

Reorder the terms:
-5.6 + 5.6 + 2.8x + x2 = 0 + 5.6

Combine like terms: -5.6 + 5.6 = 0.0
0.0 + 2.8x + x2 = 0 + 5.6
2.8x + x2 = 0 + 5.6

Combine like terms: 0 + 5.6 = 5.6
2.8x + x2 = 5.6

The x term is 2.8x.  Take half its coefficient (1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
2.8x + 1.96 + x2 = 5.6 + 1.96

Reorder the terms:
1.96 + 2.8x + x2 = 5.6 + 1.96

Combine like terms: 5.6 + 1.96 = 7.56
1.96 + 2.8x + x2 = 7.56

Factor a perfect square on the left side:
(x + 1.4)(x + 1.4) = 7.56

Calculate the square root of the right side: 2.749545417

Break this problem into two subproblems by setting 
(x + 1.4) equal to 2.749545417 and -2.749545417.

Subproblem 1

x + 1.4 = 2.749545417 Simplifying x + 1.4 = 2.749545417 Reorder the terms: 1.4 + x = 2.749545417 Solving 1.4 + x = 2.749545417 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.4' to each side of the equation. 1.4 + -1.4 + x = 2.749545417 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + x = 2.749545417 + -1.4 x = 2.749545417 + -1.4 Combine like terms: 2.749545417 + -1.4 = 1.349545417 x = 1.349545417 Simplifying x = 1.349545417

Subproblem 2

x + 1.4 = -2.749545417 Simplifying x + 1.4 = -2.749545417 Reorder the terms: 1.4 + x = -2.749545417 Solving 1.4 + x = -2.749545417 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.4' to each side of the equation. 1.4 + -1.4 + x = -2.749545417 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + x = -2.749545417 + -1.4 x = -2.749545417 + -1.4 Combine like terms: -2.749545417 + -1.4 = -4.149545417 x = -4.149545417 Simplifying x = -4.149545417

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.349545417, -4.149545417}

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