1.2+.8x=.75x(x+6)

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Solution for 1.2+.8x=.75x(x+6) equation:


Simplifying
1.2 + 0.8x = 0.75x(x + 6)

Reorder the terms:
1.2 + 0.8x = 0.75x(6 + x)
1.2 + 0.8x = (6 * 0.75x + x * 0.75x)
1.2 + 0.8x = (4.5x + 0.75x2)

Solving
1.2 + 0.8x = 4.5x + 0.75x2

Solving for variable 'x'.

Combine like terms: 0.8x + -4.5x = -3.7x
1.2 + -3.7x + -0.75x2 = 4.5x + 0.75x2 + -4.5x + -0.75x2

Reorder the terms:
1.2 + -3.7x + -0.75x2 = 4.5x + -4.5x + 0.75x2 + -0.75x2

Combine like terms: 4.5x + -4.5x = 0.0
1.2 + -3.7x + -0.75x2 = 0.0 + 0.75x2 + -0.75x2
1.2 + -3.7x + -0.75x2 = 0.75x2 + -0.75x2

Combine like terms: 0.75x2 + -0.75x2 = 0.00
1.2 + -3.7x + -0.75x2 = 0.00

Begin completing the square.  Divide all terms by
-0.75 the coefficient of the squared term: 

Divide each side by '-0.75'.
-1.6 + 4.933333333x + x2 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + 4.933333333x + 1.6 + x2 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + 4.933333333x + x2 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + 4.933333333x + x2 = 0 + 1.6
4.933333333x + x2 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
4.933333333x + x2 = 1.6

The x term is 4.933333333x.  Take half its coefficient (2.466666667).
Square it (6.084444446) and add it to both sides.

Add '6.084444446' to each side of the equation.
4.933333333x + 6.084444446 + x2 = 1.6 + 6.084444446

Reorder the terms:
6.084444446 + 4.933333333x + x2 = 1.6 + 6.084444446

Combine like terms: 1.6 + 6.084444446 = 7.684444446
6.084444446 + 4.933333333x + x2 = 7.684444446

Factor a perfect square on the left side:
(x + 2.466666667)(x + 2.466666667) = 7.684444446

Calculate the square root of the right side: 2.772083052

Break this problem into two subproblems by setting 
(x + 2.466666667) equal to 2.772083052 and -2.772083052.

Subproblem 1

x + 2.466666667 = 2.772083052 Simplifying x + 2.466666667 = 2.772083052 Reorder the terms: 2.466666667 + x = 2.772083052 Solving 2.466666667 + x = 2.772083052 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.466666667' to each side of the equation. 2.466666667 + -2.466666667 + x = 2.772083052 + -2.466666667 Combine like terms: 2.466666667 + -2.466666667 = 0.000000000 0.000000000 + x = 2.772083052 + -2.466666667 x = 2.772083052 + -2.466666667 Combine like terms: 2.772083052 + -2.466666667 = 0.305416385 x = 0.305416385 Simplifying x = 0.305416385

Subproblem 2

x + 2.466666667 = -2.772083052 Simplifying x + 2.466666667 = -2.772083052 Reorder the terms: 2.466666667 + x = -2.772083052 Solving 2.466666667 + x = -2.772083052 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.466666667' to each side of the equation. 2.466666667 + -2.466666667 + x = -2.772083052 + -2.466666667 Combine like terms: 2.466666667 + -2.466666667 = 0.000000000 0.000000000 + x = -2.772083052 + -2.466666667 x = -2.772083052 + -2.466666667 Combine like terms: -2.772083052 + -2.466666667 = -5.238749719 x = -5.238749719 Simplifying x = -5.238749719

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.305416385, -5.238749719}

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