3x^2+16x+9=-16x-12

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Solution for 3x^2+16x+9=-16x-12 equation:


Simplifying
3x2 + 16x + 9 = -16x + -12

Reorder the terms:
9 + 16x + 3x2 = -16x + -12

Reorder the terms:
9 + 16x + 3x2 = -12 + -16x

Solving
9 + 16x + 3x2 = -12 + -16x

Solving for variable 'x'.

Reorder the terms:
9 + 12 + 16x + 16x + 3x2 = -12 + -16x + 12 + 16x

Combine like terms: 9 + 12 = 21
21 + 16x + 16x + 3x2 = -12 + -16x + 12 + 16x

Combine like terms: 16x + 16x = 32x
21 + 32x + 3x2 = -12 + -16x + 12 + 16x

Reorder the terms:
21 + 32x + 3x2 = -12 + 12 + -16x + 16x

Combine like terms: -12 + 12 = 0
21 + 32x + 3x2 = 0 + -16x + 16x
21 + 32x + 3x2 = -16x + 16x

Combine like terms: -16x + 16x = 0
21 + 32x + 3x2 = 0

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

Divide each side by '3'.
7 + 10.66666667x + x2 = 0

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + 10.66666667x + -7 + x2 = 0 + -7

Reorder the terms:
7 + -7 + 10.66666667x + x2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + 10.66666667x + x2 = 0 + -7
10.66666667x + x2 = 0 + -7

Combine like terms: 0 + -7 = -7
10.66666667x + x2 = -7

The x term is 10.66666667x.  Take half its coefficient (5.333333335).
Square it (28.44444446) and add it to both sides.

Add '28.44444446' to each side of the equation.
10.66666667x + 28.44444446 + x2 = -7 + 28.44444446

Reorder the terms:
28.44444446 + 10.66666667x + x2 = -7 + 28.44444446

Combine like terms: -7 + 28.44444446 = 21.44444446
28.44444446 + 10.66666667x + x2 = 21.44444446

Factor a perfect square on the left side:
(x + 5.333333335)(x + 5.333333335) = 21.44444446

Calculate the square root of the right side: 4.630814665

Break this problem into two subproblems by setting 
(x + 5.333333335) equal to 4.630814665 and -4.630814665.

Subproblem 1

x + 5.333333335 = 4.630814665 Simplifying x + 5.333333335 = 4.630814665 Reorder the terms: 5.333333335 + x = 4.630814665 Solving 5.333333335 + x = 4.630814665 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.333333335' to each side of the equation. 5.333333335 + -5.333333335 + x = 4.630814665 + -5.333333335 Combine like terms: 5.333333335 + -5.333333335 = 0.000000000 0.000000000 + x = 4.630814665 + -5.333333335 x = 4.630814665 + -5.333333335 Combine like terms: 4.630814665 + -5.333333335 = -0.70251867 x = -0.70251867 Simplifying x = -0.70251867

Subproblem 2

x + 5.333333335 = -4.630814665 Simplifying x + 5.333333335 = -4.630814665 Reorder the terms: 5.333333335 + x = -4.630814665 Solving 5.333333335 + x = -4.630814665 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.333333335' to each side of the equation. 5.333333335 + -5.333333335 + x = -4.630814665 + -5.333333335 Combine like terms: 5.333333335 + -5.333333335 = 0.000000000 0.000000000 + x = -4.630814665 + -5.333333335 x = -4.630814665 + -5.333333335 Combine like terms: -4.630814665 + -5.333333335 = -9.964148 x = -9.964148 Simplifying x = -9.964148

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.70251867, -9.964148}

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