3x+20=4-3x(8-3x)

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Solution for 3x+20=4-3x(8-3x) equation:


Simplifying
3x + 20 = 4 + -3x(8 + -3x)

Reorder the terms:
20 + 3x = 4 + -3x(8 + -3x)
20 + 3x = 4 + (8 * -3x + -3x * -3x)
20 + 3x = 4 + (-24x + 9x2)

Solving
20 + 3x = 4 + -24x + 9x2

Solving for variable 'x'.

Reorder the terms:
20 + -4 + 3x + 24x + -9x2 = 4 + -24x + 9x2 + -4 + 24x + -9x2

Combine like terms: 20 + -4 = 16
16 + 3x + 24x + -9x2 = 4 + -24x + 9x2 + -4 + 24x + -9x2

Combine like terms: 3x + 24x = 27x
16 + 27x + -9x2 = 4 + -24x + 9x2 + -4 + 24x + -9x2

Reorder the terms:
16 + 27x + -9x2 = 4 + -4 + -24x + 24x + 9x2 + -9x2

Combine like terms: 4 + -4 = 0
16 + 27x + -9x2 = 0 + -24x + 24x + 9x2 + -9x2
16 + 27x + -9x2 = -24x + 24x + 9x2 + -9x2

Combine like terms: -24x + 24x = 0
16 + 27x + -9x2 = 0 + 9x2 + -9x2
16 + 27x + -9x2 = 9x2 + -9x2

Combine like terms: 9x2 + -9x2 = 0
16 + 27x + -9x2 = 0

Begin completing the square.  Divide all terms by
-9 the coefficient of the squared term: 

Divide each side by '-9'.
-1.777777778 + -3x + x2 = 0

Move the constant term to the right:

Add '1.777777778' to each side of the equation.
-1.777777778 + -3x + 1.777777778 + x2 = 0 + 1.777777778

Reorder the terms:
-1.777777778 + 1.777777778 + -3x + x2 = 0 + 1.777777778

Combine like terms: -1.777777778 + 1.777777778 = 0.000000000
0.000000000 + -3x + x2 = 0 + 1.777777778
-3x + x2 = 0 + 1.777777778

Combine like terms: 0 + 1.777777778 = 1.777777778
-3x + x2 = 1.777777778

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 1.777777778 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 1.777777778 + 2.25

Combine like terms: 1.777777778 + 2.25 = 4.027777778
2.25 + -3x + x2 = 4.027777778

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 4.027777778

Calculate the square root of the right side: 2.00693243

Break this problem into two subproblems by setting 
(x + -1.5) equal to 2.00693243 and -2.00693243.

Subproblem 1

x + -1.5 = 2.00693243 Simplifying x + -1.5 = 2.00693243 Reorder the terms: -1.5 + x = 2.00693243 Solving -1.5 + x = 2.00693243 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 2.00693243 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 2.00693243 + 1.5 x = 2.00693243 + 1.5 Combine like terms: 2.00693243 + 1.5 = 3.50693243 x = 3.50693243 Simplifying x = 3.50693243

Subproblem 2

x + -1.5 = -2.00693243 Simplifying x + -1.5 = -2.00693243 Reorder the terms: -1.5 + x = -2.00693243 Solving -1.5 + x = -2.00693243 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -2.00693243 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -2.00693243 + 1.5 x = -2.00693243 + 1.5 Combine like terms: -2.00693243 + 1.5 = -0.50693243 x = -0.50693243 Simplifying x = -0.50693243

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.50693243, -0.50693243}

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