28=(x+3)(x+3)

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Solution for 28=(x+3)(x+3) equation:


Simplifying
28 = (x + 3)(x + 3)

Reorder the terms:
28 = (3 + x)(x + 3)

Reorder the terms:
28 = (3 + x)(3 + x)

Multiply (3 + x) * (3 + x)
28 = (3(3 + x) + x(3 + x))
28 = ((3 * 3 + x * 3) + x(3 + x))
28 = ((9 + 3x) + x(3 + x))
28 = (9 + 3x + (3 * x + x * x))
28 = (9 + 3x + (3x + x2))

Combine like terms: 3x + 3x = 6x
28 = (9 + 6x + x2)

Solving
28 = 9 + 6x + x2

Solving for variable 'x'.

Combine like terms: 28 + -9 = 19
19 + -6x + -1x2 = 9 + 6x + x2 + -9 + -6x + -1x2

Reorder the terms:
19 + -6x + -1x2 = 9 + -9 + 6x + -6x + x2 + -1x2

Combine like terms: 9 + -9 = 0
19 + -6x + -1x2 = 0 + 6x + -6x + x2 + -1x2
19 + -6x + -1x2 = 6x + -6x + x2 + -1x2

Combine like terms: 6x + -6x = 0
19 + -6x + -1x2 = 0 + x2 + -1x2
19 + -6x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
19 + -6x + -1x2 = 0

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

Divide each side by '-1'.
-19 + 6x + x2 = 0

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + 6x + 19 + x2 = 0 + 19

Reorder the terms:
-19 + 19 + 6x + x2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + 6x + x2 = 0 + 19
6x + x2 = 0 + 19

Combine like terms: 0 + 19 = 19
6x + x2 = 19

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 = 19 + 9

Reorder the terms:
9 + 6x + x2 = 19 + 9

Combine like terms: 19 + 9 = 28
9 + 6x + x2 = 28

Factor a perfect square on the left side:
(x + 3)(x + 3) = 28

Calculate the square root of the right side: 5.291502622

Break this problem into two subproblems by setting 
(x + 3) equal to 5.291502622 and -5.291502622.

Subproblem 1

x + 3 = 5.291502622 Simplifying x + 3 = 5.291502622 Reorder the terms: 3 + x = 5.291502622 Solving 3 + x = 5.291502622 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 = 5.291502622 + -3 Combine like terms: 3 + -3 = 0 0 + x = 5.291502622 + -3 x = 5.291502622 + -3 Combine like terms: 5.291502622 + -3 = 2.291502622 x = 2.291502622 Simplifying x = 2.291502622

Subproblem 2

x + 3 = -5.291502622 Simplifying x + 3 = -5.291502622 Reorder the terms: 3 + x = -5.291502622 Solving 3 + x = -5.291502622 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 = -5.291502622 + -3 Combine like terms: 3 + -3 = 0 0 + x = -5.291502622 + -3 x = -5.291502622 + -3 Combine like terms: -5.291502622 + -3 = -8.291502622 x = -8.291502622 Simplifying x = -8.291502622

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.291502622, -8.291502622}

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