3x^2-6x-28=0

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Solution for 3x^2-6x-28=0 equation:


Simplifying
3x2 + -6x + -28 = 0

Reorder the terms:
-28 + -6x + 3x2 = 0

Solving
-28 + -6x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-9.333333333 + -2x + x2 = 0

Move the constant term to the right:

Add '9.333333333' to each side of the equation.
-9.333333333 + -2x + 9.333333333 + x2 = 0 + 9.333333333

Reorder the terms:
-9.333333333 + 9.333333333 + -2x + x2 = 0 + 9.333333333

Combine like terms: -9.333333333 + 9.333333333 = 0.000000000
0.000000000 + -2x + x2 = 0 + 9.333333333
-2x + x2 = 0 + 9.333333333

Combine like terms: 0 + 9.333333333 = 9.333333333
-2x + x2 = 9.333333333

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 = 9.333333333 + 1

Reorder the terms:
1 + -2x + x2 = 9.333333333 + 1

Combine like terms: 9.333333333 + 1 = 10.333333333
1 + -2x + x2 = 10.333333333

Factor a perfect square on the left side:
(x + -1)(x + -1) = 10.333333333

Calculate the square root of the right side: 3.214550254

Break this problem into two subproblems by setting 
(x + -1) equal to 3.214550254 and -3.214550254.

Subproblem 1

x + -1 = 3.214550254 Simplifying x + -1 = 3.214550254 Reorder the terms: -1 + x = 3.214550254 Solving -1 + x = 3.214550254 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 = 3.214550254 + 1 Combine like terms: -1 + 1 = 0 0 + x = 3.214550254 + 1 x = 3.214550254 + 1 Combine like terms: 3.214550254 + 1 = 4.214550254 x = 4.214550254 Simplifying x = 4.214550254

Subproblem 2

x + -1 = -3.214550254 Simplifying x + -1 = -3.214550254 Reorder the terms: -1 + x = -3.214550254 Solving -1 + x = -3.214550254 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 = -3.214550254 + 1 Combine like terms: -1 + 1 = 0 0 + x = -3.214550254 + 1 x = -3.214550254 + 1 Combine like terms: -3.214550254 + 1 = -2.214550254 x = -2.214550254 Simplifying x = -2.214550254

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.214550254, -2.214550254}

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