0.4x-0.4x(0.4-0.1x)=11.52

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Solution for 0.4x-0.4x(0.4-0.1x)=11.52 equation:


Simplifying
0.4x + -0.4x(0.4 + -0.1x) = 11.52
0.4x + (0.4 * -0.4x + -0.1x * -0.4x) = 11.52
0.4x + (-0.16x + 0.04x2) = 11.52

Combine like terms: 0.4x + -0.16x = 0.24x
0.24x + 0.04x2 = 11.52

Solving
0.24x + 0.04x2 = 11.52

Solving for variable 'x'.

Reorder the terms:
-11.52 + 0.24x + 0.04x2 = 11.52 + -11.52

Combine like terms: 11.52 + -11.52 = 0.00
-11.52 + 0.24x + 0.04x2 = 0.00

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

Divide each side by '0.04'.
-288 + 6x + x2 = 0

Move the constant term to the right:

Add '288' to each side of the equation.
-288 + 6x + 288 + x2 = 0 + 288

Reorder the terms:
-288 + 288 + 6x + x2 = 0 + 288

Combine like terms: -288 + 288 = 0
0 + 6x + x2 = 0 + 288
6x + x2 = 0 + 288

Combine like terms: 0 + 288 = 288
6x + x2 = 288

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 288 + 9

Reorder the terms:
9 + 6x + x2 = 288 + 9

Combine like terms: 288 + 9 = 297
9 + 6x + x2 = 297

Factor a perfect square on the left side:
(x + 3)(x + 3) = 297

Calculate the square root of the right side: 17.23368794

Break this problem into two subproblems by setting 
(x + 3) equal to 17.23368794 and -17.23368794.

Subproblem 1

x + 3 = 17.23368794 Simplifying x + 3 = 17.23368794 Reorder the terms: 3 + x = 17.23368794 Solving 3 + x = 17.23368794 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 17.23368794 + -3 Combine like terms: 3 + -3 = 0 0 + x = 17.23368794 + -3 x = 17.23368794 + -3 Combine like terms: 17.23368794 + -3 = 14.23368794 x = 14.23368794 Simplifying x = 14.23368794

Subproblem 2

x + 3 = -17.23368794 Simplifying x + 3 = -17.23368794 Reorder the terms: 3 + x = -17.23368794 Solving 3 + x = -17.23368794 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -17.23368794 + -3 Combine like terms: 3 + -3 = 0 0 + x = -17.23368794 + -3 x = -17.23368794 + -3 Combine like terms: -17.23368794 + -3 = -20.23368794 x = -20.23368794 Simplifying x = -20.23368794

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.23368794, -20.23368794}

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