3x^2+24x+56=9

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Solution for 3x^2+24x+56=9 equation:


Simplifying
3x2 + 24x + 56 = 9

Reorder the terms:
56 + 24x + 3x2 = 9

Solving
56 + 24x + 3x2 = 9

Solving for variable 'x'.

Reorder the terms:
56 + -9 + 24x + 3x2 = 9 + -9

Combine like terms: 56 + -9 = 47
47 + 24x + 3x2 = 9 + -9

Combine like terms: 9 + -9 = 0
47 + 24x + 3x2 = 0

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

Divide each side by '3'.
15.66666667 + 8x + x2 = 0

Move the constant term to the right:

Add '-15.66666667' to each side of the equation.
15.66666667 + 8x + -15.66666667 + x2 = 0 + -15.66666667

Reorder the terms:
15.66666667 + -15.66666667 + 8x + x2 = 0 + -15.66666667

Combine like terms: 15.66666667 + -15.66666667 = 0.00000000
0.00000000 + 8x + x2 = 0 + -15.66666667
8x + x2 = 0 + -15.66666667

Combine like terms: 0 + -15.66666667 = -15.66666667
8x + x2 = -15.66666667

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = -15.66666667 + 16

Reorder the terms:
16 + 8x + x2 = -15.66666667 + 16

Combine like terms: -15.66666667 + 16 = 0.33333333
16 + 8x + x2 = 0.33333333

Factor a perfect square on the left side:
(x + 4)(x + 4) = 0.33333333

Calculate the square root of the right side: 0.577350266

Break this problem into two subproblems by setting 
(x + 4) equal to 0.577350266 and -0.577350266.

Subproblem 1

x + 4 = 0.577350266 Simplifying x + 4 = 0.577350266 Reorder the terms: 4 + x = 0.577350266 Solving 4 + x = 0.577350266 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 0.577350266 + -4 Combine like terms: 4 + -4 = 0 0 + x = 0.577350266 + -4 x = 0.577350266 + -4 Combine like terms: 0.577350266 + -4 = -3.422649734 x = -3.422649734 Simplifying x = -3.422649734

Subproblem 2

x + 4 = -0.577350266 Simplifying x + 4 = -0.577350266 Reorder the terms: 4 + x = -0.577350266 Solving 4 + x = -0.577350266 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -0.577350266 + -4 Combine like terms: 4 + -4 = 0 0 + x = -0.577350266 + -4 x = -0.577350266 + -4 Combine like terms: -0.577350266 + -4 = -4.577350266 x = -4.577350266 Simplifying x = -4.577350266

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3.422649734, -4.577350266}

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