3(x+2)=15-(x^2+4x+4)

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Solution for 3(x+2)=15-(x^2+4x+4) equation:


Simplifying
3(x + 2) = 15 + -1(x2 + 4x + 4)

Reorder the terms:
3(2 + x) = 15 + -1(x2 + 4x + 4)
(2 * 3 + x * 3) = 15 + -1(x2 + 4x + 4)
(6 + 3x) = 15 + -1(x2 + 4x + 4)

Reorder the terms:
6 + 3x = 15 + -1(4 + 4x + x2)
6 + 3x = 15 + (4 * -1 + 4x * -1 + x2 * -1)
6 + 3x = 15 + (-4 + -4x + -1x2)

Combine like terms: 15 + -4 = 11
6 + 3x = 11 + -4x + -1x2

Solving
6 + 3x = 11 + -4x + -1x2

Solving for variable 'x'.

Reorder the terms:
6 + -11 + 3x + 4x + x2 = 11 + -4x + -1x2 + -11 + 4x + x2

Combine like terms: 6 + -11 = -5
-5 + 3x + 4x + x2 = 11 + -4x + -1x2 + -11 + 4x + x2

Combine like terms: 3x + 4x = 7x
-5 + 7x + x2 = 11 + -4x + -1x2 + -11 + 4x + x2

Reorder the terms:
-5 + 7x + x2 = 11 + -11 + -4x + 4x + -1x2 + x2

Combine like terms: 11 + -11 = 0
-5 + 7x + x2 = 0 + -4x + 4x + -1x2 + x2
-5 + 7x + x2 = -4x + 4x + -1x2 + x2

Combine like terms: -4x + 4x = 0
-5 + 7x + x2 = 0 + -1x2 + x2
-5 + 7x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-5 + 7x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 7x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + 7x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 7x + x2 = 0 + 5
7x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
7x + x2 = 5

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 5 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 5 + 12.25

Combine like terms: 5 + 12.25 = 17.25
12.25 + 7x + x2 = 17.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 17.25

Calculate the square root of the right side: 4.153311931

Break this problem into two subproblems by setting 
(x + 3.5) equal to 4.153311931 and -4.153311931.

Subproblem 1

x + 3.5 = 4.153311931 Simplifying x + 3.5 = 4.153311931 Reorder the terms: 3.5 + x = 4.153311931 Solving 3.5 + x = 4.153311931 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 4.153311931 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 4.153311931 + -3.5 x = 4.153311931 + -3.5 Combine like terms: 4.153311931 + -3.5 = 0.653311931 x = 0.653311931 Simplifying x = 0.653311931

Subproblem 2

x + 3.5 = -4.153311931 Simplifying x + 3.5 = -4.153311931 Reorder the terms: 3.5 + x = -4.153311931 Solving 3.5 + x = -4.153311931 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -4.153311931 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -4.153311931 + -3.5 x = -4.153311931 + -3.5 Combine like terms: -4.153311931 + -3.5 = -7.653311931 x = -7.653311931 Simplifying x = -7.653311931

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.653311931, -7.653311931}

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