3x+2x(x-1)=8

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Solution for 3x+2x(x-1)=8 equation:


Simplifying
3x + 2x(x + -1) = 8

Reorder the terms:
3x + 2x(-1 + x) = 8
3x + (-1 * 2x + x * 2x) = 8
3x + (-2x + 2x2) = 8

Combine like terms: 3x + -2x = 1x
1x + 2x2 = 8

Solving
1x + 2x2 = 8

Solving for variable 'x'.

Reorder the terms:
-8 + 1x + 2x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + 1x + 2x2 = 0

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

Divide each side by '2'.
-4 + 0.5x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 0.5x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + 0.5x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 0.5x + x2 = 0 + 4
0.5x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
0.5x + x2 = 4

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 4 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 4 + 0.0625

Combine like terms: 4 + 0.0625 = 4.0625
0.0625 + 0.5x + x2 = 4.0625

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 4.0625

Calculate the square root of the right side: 2.015564437

Break this problem into two subproblems by setting 
(x + 0.25) equal to 2.015564437 and -2.015564437.

Subproblem 1

x + 0.25 = 2.015564437 Simplifying x + 0.25 = 2.015564437 Reorder the terms: 0.25 + x = 2.015564437 Solving 0.25 + x = 2.015564437 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 2.015564437 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 2.015564437 + -0.25 x = 2.015564437 + -0.25 Combine like terms: 2.015564437 + -0.25 = 1.765564437 x = 1.765564437 Simplifying x = 1.765564437

Subproblem 2

x + 0.25 = -2.015564437 Simplifying x + 0.25 = -2.015564437 Reorder the terms: 0.25 + x = -2.015564437 Solving 0.25 + x = -2.015564437 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -2.015564437 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -2.015564437 + -0.25 x = -2.015564437 + -0.25 Combine like terms: -2.015564437 + -0.25 = -2.265564437 x = -2.265564437 Simplifying x = -2.265564437

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.765564437, -2.265564437}

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