3x^2+6x-47=8

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Solution for 3x^2+6x-47=8 equation:


Simplifying
3x2 + 6x + -47 = 8

Reorder the terms:
-47 + 6x + 3x2 = 8

Solving
-47 + 6x + 3x2 = 8

Solving for variable 'x'.

Reorder the terms:
-47 + -8 + 6x + 3x2 = 8 + -8

Combine like terms: -47 + -8 = -55
-55 + 6x + 3x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-55 + 6x + 3x2 = 0

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

Divide each side by '3'.
-18.33333333 + 2x + x2 = 0

Move the constant term to the right:

Add '18.33333333' to each side of the equation.
-18.33333333 + 2x + 18.33333333 + x2 = 0 + 18.33333333

Reorder the terms:
-18.33333333 + 18.33333333 + 2x + x2 = 0 + 18.33333333

Combine like terms: -18.33333333 + 18.33333333 = 0.00000000
0.00000000 + 2x + x2 = 0 + 18.33333333
2x + x2 = 0 + 18.33333333

Combine like terms: 0 + 18.33333333 = 18.33333333
2x + x2 = 18.33333333

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 = 18.33333333 + 1

Reorder the terms:
1 + 2x + x2 = 18.33333333 + 1

Combine like terms: 18.33333333 + 1 = 19.33333333
1 + 2x + x2 = 19.33333333

Factor a perfect square on the left side:
(x + 1)(x + 1) = 19.33333333

Calculate the square root of the right side: 4.396968652

Break this problem into two subproblems by setting 
(x + 1) equal to 4.396968652 and -4.396968652.

Subproblem 1

x + 1 = 4.396968652 Simplifying x + 1 = 4.396968652 Reorder the terms: 1 + x = 4.396968652 Solving 1 + x = 4.396968652 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 = 4.396968652 + -1 Combine like terms: 1 + -1 = 0 0 + x = 4.396968652 + -1 x = 4.396968652 + -1 Combine like terms: 4.396968652 + -1 = 3.396968652 x = 3.396968652 Simplifying x = 3.396968652

Subproblem 2

x + 1 = -4.396968652 Simplifying x + 1 = -4.396968652 Reorder the terms: 1 + x = -4.396968652 Solving 1 + x = -4.396968652 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 = -4.396968652 + -1 Combine like terms: 1 + -1 = 0 0 + x = -4.396968652 + -1 x = -4.396968652 + -1 Combine like terms: -4.396968652 + -1 = -5.396968652 x = -5.396968652 Simplifying x = -5.396968652

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.396968652, -5.396968652}

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