3x^2+14x+9=-2x

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Solution for 3x^2+14x+9=-2x equation:


Simplifying
3x2 + 14x + 9 = -2x

Reorder the terms:
9 + 14x + 3x2 = -2x

Solving
9 + 14x + 3x2 = -2x

Solving for variable 'x'.

Reorder the terms:
9 + 14x + 2x + 3x2 = -2x + 2x

Combine like terms: 14x + 2x = 16x
9 + 16x + 3x2 = -2x + 2x

Combine like terms: -2x + 2x = 0
9 + 16x + 3x2 = 0

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

Divide each side by '3'.
3 + 5.333333333x + x2 = 0

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + 5.333333333x + -3 + x2 = 0 + -3

Reorder the terms:
3 + -3 + 5.333333333x + x2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 5.333333333x + x2 = 0 + -3
5.333333333x + x2 = 0 + -3

Combine like terms: 0 + -3 = -3
5.333333333x + x2 = -3

The x term is 5.333333333x.  Take half its coefficient (2.666666667).
Square it (7.111111113) and add it to both sides.

Add '7.111111113' to each side of the equation.
5.333333333x + 7.111111113 + x2 = -3 + 7.111111113

Reorder the terms:
7.111111113 + 5.333333333x + x2 = -3 + 7.111111113

Combine like terms: -3 + 7.111111113 = 4.111111113
7.111111113 + 5.333333333x + x2 = 4.111111113

Factor a perfect square on the left side:
(x + 2.666666667)(x + 2.666666667) = 4.111111113

Calculate the square root of the right side: 2.027587511

Break this problem into two subproblems by setting 
(x + 2.666666667) equal to 2.027587511 and -2.027587511.

Subproblem 1

x + 2.666666667 = 2.027587511 Simplifying x + 2.666666667 = 2.027587511 Reorder the terms: 2.666666667 + x = 2.027587511 Solving 2.666666667 + x = 2.027587511 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.666666667' to each side of the equation. 2.666666667 + -2.666666667 + x = 2.027587511 + -2.666666667 Combine like terms: 2.666666667 + -2.666666667 = 0.000000000 0.000000000 + x = 2.027587511 + -2.666666667 x = 2.027587511 + -2.666666667 Combine like terms: 2.027587511 + -2.666666667 = -0.639079156 x = -0.639079156 Simplifying x = -0.639079156

Subproblem 2

x + 2.666666667 = -2.027587511 Simplifying x + 2.666666667 = -2.027587511 Reorder the terms: 2.666666667 + x = -2.027587511 Solving 2.666666667 + x = -2.027587511 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.666666667' to each side of the equation. 2.666666667 + -2.666666667 + x = -2.027587511 + -2.666666667 Combine like terms: 2.666666667 + -2.666666667 = 0.000000000 0.000000000 + x = -2.027587511 + -2.666666667 x = -2.027587511 + -2.666666667 Combine like terms: -2.027587511 + -2.666666667 = -4.694254178 x = -4.694254178 Simplifying x = -4.694254178

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.639079156, -4.694254178}

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