0.4x-3=0.1x(x+30)

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Solution for 0.4x-3=0.1x(x+30) equation:


Simplifying
0.4x + -3 = 0.1x(x + 30)

Reorder the terms:
-3 + 0.4x = 0.1x(x + 30)

Reorder the terms:
-3 + 0.4x = 0.1x(30 + x)
-3 + 0.4x = (30 * 0.1x + x * 0.1x)
-3 + 0.4x = (3x + 0.1x2)

Solving
-3 + 0.4x = 3x + 0.1x2

Solving for variable 'x'.

Combine like terms: 0.4x + -3x = -2.6x
-3 + -2.6x + -0.1x2 = 3x + 0.1x2 + -3x + -0.1x2

Reorder the terms:
-3 + -2.6x + -0.1x2 = 3x + -3x + 0.1x2 + -0.1x2

Combine like terms: 3x + -3x = 0
-3 + -2.6x + -0.1x2 = 0 + 0.1x2 + -0.1x2
-3 + -2.6x + -0.1x2 = 0.1x2 + -0.1x2

Combine like terms: 0.1x2 + -0.1x2 = 0.0
-3 + -2.6x + -0.1x2 = 0.0

Begin completing the square.  Divide all terms by
-0.1 the coefficient of the squared term: 

Divide each side by '-0.1'.
30 + 26x + x2 = 0

Move the constant term to the right:

Add '-30' to each side of the equation.
30 + 26x + -30 + x2 = 0 + -30

Reorder the terms:
30 + -30 + 26x + x2 = 0 + -30

Combine like terms: 30 + -30 = 0
0 + 26x + x2 = 0 + -30
26x + x2 = 0 + -30

Combine like terms: 0 + -30 = -30
26x + x2 = -30

The x term is 26x.  Take half its coefficient (13).
Square it (169) and add it to both sides.

Add '169' to each side of the equation.
26x + 169 + x2 = -30 + 169

Reorder the terms:
169 + 26x + x2 = -30 + 169

Combine like terms: -30 + 169 = 139
169 + 26x + x2 = 139

Factor a perfect square on the left side:
(x + 13)(x + 13) = 139

Calculate the square root of the right side: 11.789826123

Break this problem into two subproblems by setting 
(x + 13) equal to 11.789826123 and -11.789826123.

Subproblem 1

x + 13 = 11.789826123 Simplifying x + 13 = 11.789826123 Reorder the terms: 13 + x = 11.789826123 Solving 13 + x = 11.789826123 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + x = 11.789826123 + -13 Combine like terms: 13 + -13 = 0 0 + x = 11.789826123 + -13 x = 11.789826123 + -13 Combine like terms: 11.789826123 + -13 = -1.210173877 x = -1.210173877 Simplifying x = -1.210173877

Subproblem 2

x + 13 = -11.789826123 Simplifying x + 13 = -11.789826123 Reorder the terms: 13 + x = -11.789826123 Solving 13 + x = -11.789826123 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + x = -11.789826123 + -13 Combine like terms: 13 + -13 = 0 0 + x = -11.789826123 + -13 x = -11.789826123 + -13 Combine like terms: -11.789826123 + -13 = -24.789826123 x = -24.789826123 Simplifying x = -24.789826123

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.210173877, -24.789826123}

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