x(6-x)-7.2=0

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Solution for x(6-x)-7.2=0 equation:


Simplifying
x(6 + -1x) + -7.2 = 0
(6 * x + -1x * x) + -7.2 = 0
(6x + -1x2) + -7.2 = 0

Reorder the terms:
-7.2 + 6x + -1x2 = 0

Solving
-7.2 + 6x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
7.2 + -6x + x2 = 0

Move the constant term to the right:

Add '-7.2' to each side of the equation.
7.2 + -6x + -7.2 + x2 = 0 + -7.2

Reorder the terms:
7.2 + -7.2 + -6x + x2 = 0 + -7.2

Combine like terms: 7.2 + -7.2 = 0.0
0.0 + -6x + x2 = 0 + -7.2
-6x + x2 = 0 + -7.2

Combine like terms: 0 + -7.2 = -7.2
-6x + x2 = -7.2

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 = -7.2 + 9

Reorder the terms:
9 + -6x + x2 = -7.2 + 9

Combine like terms: -7.2 + 9 = 1.8
9 + -6x + x2 = 1.8

Factor a perfect square on the left side:
(x + -3)(x + -3) = 1.8

Calculate the square root of the right side: 1.341640787

Break this problem into two subproblems by setting 
(x + -3) equal to 1.341640787 and -1.341640787.

Subproblem 1

x + -3 = 1.341640787 Simplifying x + -3 = 1.341640787 Reorder the terms: -3 + x = 1.341640787 Solving -3 + x = 1.341640787 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 = 1.341640787 + 3 Combine like terms: -3 + 3 = 0 0 + x = 1.341640787 + 3 x = 1.341640787 + 3 Combine like terms: 1.341640787 + 3 = 4.341640787 x = 4.341640787 Simplifying x = 4.341640787

Subproblem 2

x + -3 = -1.341640787 Simplifying x + -3 = -1.341640787 Reorder the terms: -3 + x = -1.341640787 Solving -3 + x = -1.341640787 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 = -1.341640787 + 3 Combine like terms: -3 + 3 = 0 0 + x = -1.341640787 + 3 x = -1.341640787 + 3 Combine like terms: -1.341640787 + 3 = 1.658359213 x = 1.658359213 Simplifying x = 1.658359213

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.341640787, 1.658359213}

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