5x(x+9)=x-4

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Solution for 5x(x+9)=x-4 equation:


Simplifying
5x(x + 9) = x + -4

Reorder the terms:
5x(9 + x) = x + -4
(9 * 5x + x * 5x) = x + -4
(45x + 5x2) = x + -4

Reorder the terms:
45x + 5x2 = -4 + x

Solving
45x + 5x2 = -4 + x

Solving for variable 'x'.

Reorder the terms:
4 + 45x + -1x + 5x2 = -4 + x + 4 + -1x

Combine like terms: 45x + -1x = 44x
4 + 44x + 5x2 = -4 + x + 4 + -1x

Reorder the terms:
4 + 44x + 5x2 = -4 + 4 + x + -1x

Combine like terms: -4 + 4 = 0
4 + 44x + 5x2 = 0 + x + -1x
4 + 44x + 5x2 = x + -1x

Combine like terms: x + -1x = 0
4 + 44x + 5x2 = 0

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

Divide each side by '5'.
0.8 + 8.8x + x2 = 0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + 8.8x + -0.8 + x2 = 0 + -0.8

Reorder the terms:
0.8 + -0.8 + 8.8x + x2 = 0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + 8.8x + x2 = 0 + -0.8
8.8x + x2 = 0 + -0.8

Combine like terms: 0 + -0.8 = -0.8
8.8x + x2 = -0.8

The x term is 8.8x.  Take half its coefficient (4.4).
Square it (19.36) and add it to both sides.

Add '19.36' to each side of the equation.
8.8x + 19.36 + x2 = -0.8 + 19.36

Reorder the terms:
19.36 + 8.8x + x2 = -0.8 + 19.36

Combine like terms: -0.8 + 19.36 = 18.56
19.36 + 8.8x + x2 = 18.56

Factor a perfect square on the left side:
(x + 4.4)(x + 4.4) = 18.56

Calculate the square root of the right side: 4.308131846

Break this problem into two subproblems by setting 
(x + 4.4) equal to 4.308131846 and -4.308131846.

Subproblem 1

x + 4.4 = 4.308131846 Simplifying x + 4.4 = 4.308131846 Reorder the terms: 4.4 + x = 4.308131846 Solving 4.4 + x = 4.308131846 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.4' to each side of the equation. 4.4 + -4.4 + x = 4.308131846 + -4.4 Combine like terms: 4.4 + -4.4 = 0.0 0.0 + x = 4.308131846 + -4.4 x = 4.308131846 + -4.4 Combine like terms: 4.308131846 + -4.4 = -0.091868154 x = -0.091868154 Simplifying x = -0.091868154

Subproblem 2

x + 4.4 = -4.308131846 Simplifying x + 4.4 = -4.308131846 Reorder the terms: 4.4 + x = -4.308131846 Solving 4.4 + x = -4.308131846 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.4' to each side of the equation. 4.4 + -4.4 + x = -4.308131846 + -4.4 Combine like terms: 4.4 + -4.4 = 0.0 0.0 + x = -4.308131846 + -4.4 x = -4.308131846 + -4.4 Combine like terms: -4.308131846 + -4.4 = -8.708131846 x = -8.708131846 Simplifying x = -8.708131846

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.091868154, -8.708131846}

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