36=(x+3)(x+4)

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Solution for 36=(x+3)(x+4) equation:


Simplifying
36 = (x + 3)(x + 4)

Reorder the terms:
36 = (3 + x)(x + 4)

Reorder the terms:
36 = (3 + x)(4 + x)

Multiply (3 + x) * (4 + x)
36 = (3(4 + x) + x(4 + x))
36 = ((4 * 3 + x * 3) + x(4 + x))
36 = ((12 + 3x) + x(4 + x))
36 = (12 + 3x + (4 * x + x * x))
36 = (12 + 3x + (4x + x2))

Combine like terms: 3x + 4x = 7x
36 = (12 + 7x + x2)

Solving
36 = 12 + 7x + x2

Solving for variable 'x'.

Combine like terms: 36 + -12 = 24
24 + -7x + -1x2 = 12 + 7x + x2 + -12 + -7x + -1x2

Reorder the terms:
24 + -7x + -1x2 = 12 + -12 + 7x + -7x + x2 + -1x2

Combine like terms: 12 + -12 = 0
24 + -7x + -1x2 = 0 + 7x + -7x + x2 + -1x2
24 + -7x + -1x2 = 7x + -7x + x2 + -1x2

Combine like terms: 7x + -7x = 0
24 + -7x + -1x2 = 0 + x2 + -1x2
24 + -7x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
24 + -7x + -1x2 = 0

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

Divide each side by '-1'.
-24 + 7x + x2 = 0

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + 7x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + 7x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + 7x + x2 = 0 + 24
7x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
7x + x2 = 24

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 = 24 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 24 + 12.25

Combine like terms: 24 + 12.25 = 36.25
12.25 + 7x + x2 = 36.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 36.25

Calculate the square root of the right side: 6.020797289

Break this problem into two subproblems by setting 
(x + 3.5) equal to 6.020797289 and -6.020797289.

Subproblem 1

x + 3.5 = 6.020797289 Simplifying x + 3.5 = 6.020797289 Reorder the terms: 3.5 + x = 6.020797289 Solving 3.5 + x = 6.020797289 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 = 6.020797289 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 6.020797289 + -3.5 x = 6.020797289 + -3.5 Combine like terms: 6.020797289 + -3.5 = 2.520797289 x = 2.520797289 Simplifying x = 2.520797289

Subproblem 2

x + 3.5 = -6.020797289 Simplifying x + 3.5 = -6.020797289 Reorder the terms: 3.5 + x = -6.020797289 Solving 3.5 + x = -6.020797289 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 = -6.020797289 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -6.020797289 + -3.5 x = -6.020797289 + -3.5 Combine like terms: -6.020797289 + -3.5 = -9.520797289 x = -9.520797289 Simplifying x = -9.520797289

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.520797289, -9.520797289}

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