x^2-3x=12-(x-2)

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Solution for x^2-3x=12-(x-2) equation:


Simplifying
x2 + -3x = 12 + -1(x + -2)

Reorder the terms:
-3x + x2 = 12 + -1(x + -2)

Reorder the terms:
-3x + x2 = 12 + -1(-2 + x)
-3x + x2 = 12 + (-2 * -1 + x * -1)
-3x + x2 = 12 + (2 + -1x)

Combine like terms: 12 + 2 = 14
-3x + x2 = 14 + -1x

Solving
-3x + x2 = 14 + -1x

Solving for variable 'x'.

Reorder the terms:
-14 + -3x + x + x2 = 14 + -1x + -14 + x

Combine like terms: -3x + x = -2x
-14 + -2x + x2 = 14 + -1x + -14 + x

Reorder the terms:
-14 + -2x + x2 = 14 + -14 + -1x + x

Combine like terms: 14 + -14 = 0
-14 + -2x + x2 = 0 + -1x + x
-14 + -2x + x2 = -1x + x

Combine like terms: -1x + x = 0
-14 + -2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + -2x + 14 + x2 = 0 + 14

Reorder the terms:
-14 + 14 + -2x + x2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + -2x + x2 = 0 + 14
-2x + x2 = 0 + 14

Combine like terms: 0 + 14 = 14
-2x + x2 = 14

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 14 + 1

Reorder the terms:
1 + -2x + x2 = 14 + 1

Combine like terms: 14 + 1 = 15
1 + -2x + x2 = 15

Factor a perfect square on the left side:
(x + -1)(x + -1) = 15

Calculate the square root of the right side: 3.872983346

Break this problem into two subproblems by setting 
(x + -1) equal to 3.872983346 and -3.872983346.

Subproblem 1

x + -1 = 3.872983346 Simplifying x + -1 = 3.872983346 Reorder the terms: -1 + x = 3.872983346 Solving -1 + x = 3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 3.872983346 + 1 Combine like terms: -1 + 1 = 0 0 + x = 3.872983346 + 1 x = 3.872983346 + 1 Combine like terms: 3.872983346 + 1 = 4.872983346 x = 4.872983346 Simplifying x = 4.872983346

Subproblem 2

x + -1 = -3.872983346 Simplifying x + -1 = -3.872983346 Reorder the terms: -1 + x = -3.872983346 Solving -1 + x = -3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -3.872983346 + 1 Combine like terms: -1 + 1 = 0 0 + x = -3.872983346 + 1 x = -3.872983346 + 1 Combine like terms: -3.872983346 + 1 = -2.872983346 x = -2.872983346 Simplifying x = -2.872983346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.872983346, -2.872983346}

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