3x(x-2)=7x-(x+1)

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Solution for 3x(x-2)=7x-(x+1) equation:


Simplifying
3x(x + -2) = 7x + -1(x + 1)

Reorder the terms:
3x(-2 + x) = 7x + -1(x + 1)
(-2 * 3x + x * 3x) = 7x + -1(x + 1)
(-6x + 3x2) = 7x + -1(x + 1)

Reorder the terms:
-6x + 3x2 = 7x + -1(1 + x)
-6x + 3x2 = 7x + (1 * -1 + x * -1)
-6x + 3x2 = 7x + (-1 + -1x)

Reorder the terms:
-6x + 3x2 = -1 + 7x + -1x

Combine like terms: 7x + -1x = 6x
-6x + 3x2 = -1 + 6x

Solving
-6x + 3x2 = -1 + 6x

Solving for variable 'x'.

Reorder the terms:
1 + -6x + -6x + 3x2 = -1 + 6x + 1 + -6x

Combine like terms: -6x + -6x = -12x
1 + -12x + 3x2 = -1 + 6x + 1 + -6x

Reorder the terms:
1 + -12x + 3x2 = -1 + 1 + 6x + -6x

Combine like terms: -1 + 1 = 0
1 + -12x + 3x2 = 0 + 6x + -6x
1 + -12x + 3x2 = 6x + -6x

Combine like terms: 6x + -6x = 0
1 + -12x + 3x2 = 0

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

Divide each side by '3'.
0.3333333333 + -4x + x2 = 0

Move the constant term to the right:

Add '-0.3333333333' to each side of the equation.
0.3333333333 + -4x + -0.3333333333 + x2 = 0 + -0.3333333333

Reorder the terms:
0.3333333333 + -0.3333333333 + -4x + x2 = 0 + -0.3333333333

Combine like terms: 0.3333333333 + -0.3333333333 = 0.0000000000
0.0000000000 + -4x + x2 = 0 + -0.3333333333
-4x + x2 = 0 + -0.3333333333

Combine like terms: 0 + -0.3333333333 = -0.3333333333
-4x + x2 = -0.3333333333

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = -0.3333333333 + 4

Reorder the terms:
4 + -4x + x2 = -0.3333333333 + 4

Combine like terms: -0.3333333333 + 4 = 3.6666666667
4 + -4x + x2 = 3.6666666667

Factor a perfect square on the left side:
(x + -2)(x + -2) = 3.6666666667

Calculate the square root of the right side: 1.914854216

Break this problem into two subproblems by setting 
(x + -2) equal to 1.914854216 and -1.914854216.

Subproblem 1

x + -2 = 1.914854216 Simplifying x + -2 = 1.914854216 Reorder the terms: -2 + x = 1.914854216 Solving -2 + x = 1.914854216 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 1.914854216 + 2 Combine like terms: -2 + 2 = 0 0 + x = 1.914854216 + 2 x = 1.914854216 + 2 Combine like terms: 1.914854216 + 2 = 3.914854216 x = 3.914854216 Simplifying x = 3.914854216

Subproblem 2

x + -2 = -1.914854216 Simplifying x + -2 = -1.914854216 Reorder the terms: -2 + x = -1.914854216 Solving -2 + x = -1.914854216 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -1.914854216 + 2 Combine like terms: -2 + 2 = 0 0 + x = -1.914854216 + 2 x = -1.914854216 + 2 Combine like terms: -1.914854216 + 2 = 0.085145784 x = 0.085145784 Simplifying x = 0.085145784

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.914854216, 0.085145784}

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