(3-x)(x+4)+16=12x-(x+3)

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Solution for (3-x)(x+4)+16=12x-(x+3) equation:


Simplifying
(3 + -1x)(x + 4) + 16 = 12x + -1(x + 3)

Reorder the terms:
(3 + -1x)(4 + x) + 16 = 12x + -1(x + 3)

Multiply (3 + -1x) * (4 + x)
(3(4 + x) + -1x * (4 + x)) + 16 = 12x + -1(x + 3)
((4 * 3 + x * 3) + -1x * (4 + x)) + 16 = 12x + -1(x + 3)
((12 + 3x) + -1x * (4 + x)) + 16 = 12x + -1(x + 3)
(12 + 3x + (4 * -1x + x * -1x)) + 16 = 12x + -1(x + 3)
(12 + 3x + (-4x + -1x2)) + 16 = 12x + -1(x + 3)

Combine like terms: 3x + -4x = -1x
(12 + -1x + -1x2) + 16 = 12x + -1(x + 3)

Reorder the terms:
12 + 16 + -1x + -1x2 = 12x + -1(x + 3)

Combine like terms: 12 + 16 = 28
28 + -1x + -1x2 = 12x + -1(x + 3)

Reorder the terms:
28 + -1x + -1x2 = 12x + -1(3 + x)
28 + -1x + -1x2 = 12x + (3 * -1 + x * -1)
28 + -1x + -1x2 = 12x + (-3 + -1x)

Reorder the terms:
28 + -1x + -1x2 = -3 + 12x + -1x

Combine like terms: 12x + -1x = 11x
28 + -1x + -1x2 = -3 + 11x

Solving
28 + -1x + -1x2 = -3 + 11x

Solving for variable 'x'.

Reorder the terms:
28 + 3 + -1x + -11x + -1x2 = -3 + 11x + 3 + -11x

Combine like terms: 28 + 3 = 31
31 + -1x + -11x + -1x2 = -3 + 11x + 3 + -11x

Combine like terms: -1x + -11x = -12x
31 + -12x + -1x2 = -3 + 11x + 3 + -11x

Reorder the terms:
31 + -12x + -1x2 = -3 + 3 + 11x + -11x

Combine like terms: -3 + 3 = 0
31 + -12x + -1x2 = 0 + 11x + -11x
31 + -12x + -1x2 = 11x + -11x

Combine like terms: 11x + -11x = 0
31 + -12x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-31 + 12x + x2 = 0

Move the constant term to the right:

Add '31' to each side of the equation.
-31 + 12x + 31 + x2 = 0 + 31

Reorder the terms:
-31 + 31 + 12x + x2 = 0 + 31

Combine like terms: -31 + 31 = 0
0 + 12x + x2 = 0 + 31
12x + x2 = 0 + 31

Combine like terms: 0 + 31 = 31
12x + x2 = 31

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = 31 + 36

Reorder the terms:
36 + 12x + x2 = 31 + 36

Combine like terms: 31 + 36 = 67
36 + 12x + x2 = 67

Factor a perfect square on the left side:
(x + 6)(x + 6) = 67

Calculate the square root of the right side: 8.185352772

Break this problem into two subproblems by setting 
(x + 6) equal to 8.185352772 and -8.185352772.

Subproblem 1

x + 6 = 8.185352772 Simplifying x + 6 = 8.185352772 Reorder the terms: 6 + x = 8.185352772 Solving 6 + x = 8.185352772 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 8.185352772 + -6 Combine like terms: 6 + -6 = 0 0 + x = 8.185352772 + -6 x = 8.185352772 + -6 Combine like terms: 8.185352772 + -6 = 2.185352772 x = 2.185352772 Simplifying x = 2.185352772

Subproblem 2

x + 6 = -8.185352772 Simplifying x + 6 = -8.185352772 Reorder the terms: 6 + x = -8.185352772 Solving 6 + x = -8.185352772 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -8.185352772 + -6 Combine like terms: 6 + -6 = 0 0 + x = -8.185352772 + -6 x = -8.185352772 + -6 Combine like terms: -8.185352772 + -6 = -14.185352772 x = -14.185352772 Simplifying x = -14.185352772

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.185352772, -14.185352772}

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