(x+3)(x+3)=31

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Solution for (x+3)(x+3)=31 equation:


Simplifying
(x + 3)(x + 3) = 31

Reorder the terms:
(3 + x)(x + 3) = 31

Reorder the terms:
(3 + x)(3 + x) = 31

Multiply (3 + x) * (3 + x)
(3(3 + x) + x(3 + x)) = 31
((3 * 3 + x * 3) + x(3 + x)) = 31
((9 + 3x) + x(3 + x)) = 31
(9 + 3x + (3 * x + x * x)) = 31
(9 + 3x + (3x + x2)) = 31

Combine like terms: 3x + 3x = 6x
(9 + 6x + x2) = 31

Solving
9 + 6x + x2 = 31

Solving for variable 'x'.

Reorder the terms:
9 + -31 + 6x + x2 = 31 + -31

Combine like terms: 9 + -31 = -22
-22 + 6x + x2 = 31 + -31

Combine like terms: 31 + -31 = 0
-22 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '22' to each side of the equation.
-22 + 6x + 22 + x2 = 0 + 22

Reorder the terms:
-22 + 22 + 6x + x2 = 0 + 22

Combine like terms: -22 + 22 = 0
0 + 6x + x2 = 0 + 22
6x + x2 = 0 + 22

Combine like terms: 0 + 22 = 22
6x + x2 = 22

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 22 + 9

Reorder the terms:
9 + 6x + x2 = 22 + 9

Combine like terms: 22 + 9 = 31
9 + 6x + x2 = 31

Factor a perfect square on the left side:
(x + 3)(x + 3) = 31

Calculate the square root of the right side: 5.567764363

Break this problem into two subproblems by setting 
(x + 3) equal to 5.567764363 and -5.567764363.

Subproblem 1

x + 3 = 5.567764363 Simplifying x + 3 = 5.567764363 Reorder the terms: 3 + x = 5.567764363 Solving 3 + x = 5.567764363 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 5.567764363 + -3 Combine like terms: 3 + -3 = 0 0 + x = 5.567764363 + -3 x = 5.567764363 + -3 Combine like terms: 5.567764363 + -3 = 2.567764363 x = 2.567764363 Simplifying x = 2.567764363

Subproblem 2

x + 3 = -5.567764363 Simplifying x + 3 = -5.567764363 Reorder the terms: 3 + x = -5.567764363 Solving 3 + x = -5.567764363 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -5.567764363 + -3 Combine like terms: 3 + -3 = 0 0 + x = -5.567764363 + -3 x = -5.567764363 + -3 Combine like terms: -5.567764363 + -3 = -8.567764363 x = -8.567764363 Simplifying x = -8.567764363

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.567764363, -8.567764363}

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