5x(x+4)-8=x+32

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Solution for 5x(x+4)-8=x+32 equation:


Simplifying
5x(x + 4) + -8 = x + 32

Reorder the terms:
5x(4 + x) + -8 = x + 32
(4 * 5x + x * 5x) + -8 = x + 32
(20x + 5x2) + -8 = x + 32

Reorder the terms:
-8 + 20x + 5x2 = x + 32

Reorder the terms:
-8 + 20x + 5x2 = 32 + x

Solving
-8 + 20x + 5x2 = 32 + x

Solving for variable 'x'.

Reorder the terms:
-8 + -32 + 20x + -1x + 5x2 = 32 + x + -32 + -1x

Combine like terms: -8 + -32 = -40
-40 + 20x + -1x + 5x2 = 32 + x + -32 + -1x

Combine like terms: 20x + -1x = 19x
-40 + 19x + 5x2 = 32 + x + -32 + -1x

Reorder the terms:
-40 + 19x + 5x2 = 32 + -32 + x + -1x

Combine like terms: 32 + -32 = 0
-40 + 19x + 5x2 = 0 + x + -1x
-40 + 19x + 5x2 = x + -1x

Combine like terms: x + -1x = 0
-40 + 19x + 5x2 = 0

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

Divide each side by '5'.
-8 + 3.8x + x2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 3.8x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + 3.8x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 3.8x + x2 = 0 + 8
3.8x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
3.8x + x2 = 8

The x term is 3.8x.  Take half its coefficient (1.9).
Square it (3.61) and add it to both sides.

Add '3.61' to each side of the equation.
3.8x + 3.61 + x2 = 8 + 3.61

Reorder the terms:
3.61 + 3.8x + x2 = 8 + 3.61

Combine like terms: 8 + 3.61 = 11.61
3.61 + 3.8x + x2 = 11.61

Factor a perfect square on the left side:
(x + 1.9)(x + 1.9) = 11.61

Calculate the square root of the right side: 3.407345007

Break this problem into two subproblems by setting 
(x + 1.9) equal to 3.407345007 and -3.407345007.

Subproblem 1

x + 1.9 = 3.407345007 Simplifying x + 1.9 = 3.407345007 Reorder the terms: 1.9 + x = 3.407345007 Solving 1.9 + x = 3.407345007 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.9' to each side of the equation. 1.9 + -1.9 + x = 3.407345007 + -1.9 Combine like terms: 1.9 + -1.9 = 0.0 0.0 + x = 3.407345007 + -1.9 x = 3.407345007 + -1.9 Combine like terms: 3.407345007 + -1.9 = 1.507345007 x = 1.507345007 Simplifying x = 1.507345007

Subproblem 2

x + 1.9 = -3.407345007 Simplifying x + 1.9 = -3.407345007 Reorder the terms: 1.9 + x = -3.407345007 Solving 1.9 + x = -3.407345007 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.9' to each side of the equation. 1.9 + -1.9 + x = -3.407345007 + -1.9 Combine like terms: 1.9 + -1.9 = 0.0 0.0 + x = -3.407345007 + -1.9 x = -3.407345007 + -1.9 Combine like terms: -3.407345007 + -1.9 = -5.307345007 x = -5.307345007 Simplifying x = -5.307345007

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.507345007, -5.307345007}

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