(X+3)(X+3)=16-2X^2

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Solution for (X+3)(X+3)=16-2X^2 equation:


Simplifying
(X + 3)(X + 3) = 16 + -2X2

Reorder the terms:
(3 + X)(X + 3) = 16 + -2X2

Reorder the terms:
(3 + X)(3 + X) = 16 + -2X2

Multiply (3 + X) * (3 + X)
(3(3 + X) + X(3 + X)) = 16 + -2X2
((3 * 3 + X * 3) + X(3 + X)) = 16 + -2X2
((9 + 3X) + X(3 + X)) = 16 + -2X2
(9 + 3X + (3 * X + X * X)) = 16 + -2X2
(9 + 3X + (3X + X2)) = 16 + -2X2

Combine like terms: 3X + 3X = 6X
(9 + 6X + X2) = 16 + -2X2

Solving
9 + 6X + X2 = 16 + -2X2

Solving for variable 'X'.

Reorder the terms:
9 + -16 + 6X + X2 + 2X2 = 16 + -2X2 + -16 + 2X2

Combine like terms: 9 + -16 = -7
-7 + 6X + X2 + 2X2 = 16 + -2X2 + -16 + 2X2

Combine like terms: X2 + 2X2 = 3X2
-7 + 6X + 3X2 = 16 + -2X2 + -16 + 2X2

Reorder the terms:
-7 + 6X + 3X2 = 16 + -16 + -2X2 + 2X2

Combine like terms: 16 + -16 = 0
-7 + 6X + 3X2 = 0 + -2X2 + 2X2
-7 + 6X + 3X2 = -2X2 + 2X2

Combine like terms: -2X2 + 2X2 = 0
-7 + 6X + 3X2 = 0

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

Divide each side by '3'.
-2.333333333 + 2X + X2 = 0

Move the constant term to the right:

Add '2.333333333' to each side of the equation.
-2.333333333 + 2X + 2.333333333 + X2 = 0 + 2.333333333

Reorder the terms:
-2.333333333 + 2.333333333 + 2X + X2 = 0 + 2.333333333

Combine like terms: -2.333333333 + 2.333333333 = 0.000000000
0.000000000 + 2X + X2 = 0 + 2.333333333
2X + X2 = 0 + 2.333333333

Combine like terms: 0 + 2.333333333 = 2.333333333
2X + X2 = 2.333333333

The X term is 2X.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2X + 1 + X2 = 2.333333333 + 1

Reorder the terms:
1 + 2X + X2 = 2.333333333 + 1

Combine like terms: 2.333333333 + 1 = 3.333333333
1 + 2X + X2 = 3.333333333

Factor a perfect square on the left side:
(X + 1)(X + 1) = 3.333333333

Calculate the square root of the right side: 1.825741858

Break this problem into two subproblems by setting 
(X + 1) equal to 1.825741858 and -1.825741858.

Subproblem 1

X + 1 = 1.825741858 Simplifying X + 1 = 1.825741858 Reorder the terms: 1 + X = 1.825741858 Solving 1 + X = 1.825741858 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + X = 1.825741858 + -1 Combine like terms: 1 + -1 = 0 0 + X = 1.825741858 + -1 X = 1.825741858 + -1 Combine like terms: 1.825741858 + -1 = 0.825741858 X = 0.825741858 Simplifying X = 0.825741858

Subproblem 2

X + 1 = -1.825741858 Simplifying X + 1 = -1.825741858 Reorder the terms: 1 + X = -1.825741858 Solving 1 + X = -1.825741858 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + X = -1.825741858 + -1 Combine like terms: 1 + -1 = 0 0 + X = -1.825741858 + -1 X = -1.825741858 + -1 Combine like terms: -1.825741858 + -1 = -2.825741858 X = -2.825741858 Simplifying X = -2.825741858

Solution

The solution to the problem is based on the solutions from the subproblems. X = {0.825741858, -2.825741858}

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