(x+3)(x+4)=48

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Solution for (x+3)(x+4)=48 equation:


Simplifying
(x + 3)(x + 4) = 48

Reorder the terms:
(3 + x)(x + 4) = 48

Reorder the terms:
(3 + x)(4 + x) = 48

Multiply (3 + x) * (4 + x)
(3(4 + x) + x(4 + x)) = 48
((4 * 3 + x * 3) + x(4 + x)) = 48
((12 + 3x) + x(4 + x)) = 48
(12 + 3x + (4 * x + x * x)) = 48
(12 + 3x + (4x + x2)) = 48

Combine like terms: 3x + 4x = 7x
(12 + 7x + x2) = 48

Solving
12 + 7x + x2 = 48

Solving for variable 'x'.

Reorder the terms:
12 + -48 + 7x + x2 = 48 + -48

Combine like terms: 12 + -48 = -36
-36 + 7x + x2 = 48 + -48

Combine like terms: 48 + -48 = 0
-36 + 7x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + 7x + 36 + x2 = 0 + 36

Reorder the terms:
-36 + 36 + 7x + x2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + 7x + x2 = 0 + 36
7x + x2 = 0 + 36

Combine like terms: 0 + 36 = 36
7x + x2 = 36

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 = 36 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 36 + 12.25

Combine like terms: 36 + 12.25 = 48.25
12.25 + 7x + x2 = 48.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 48.25

Calculate the square root of the right side: 6.946221995

Break this problem into two subproblems by setting 
(x + 3.5) equal to 6.946221995 and -6.946221995.

Subproblem 1

x + 3.5 = 6.946221995 Simplifying x + 3.5 = 6.946221995 Reorder the terms: 3.5 + x = 6.946221995 Solving 3.5 + x = 6.946221995 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 = 6.946221995 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 6.946221995 + -3.5 x = 6.946221995 + -3.5 Combine like terms: 6.946221995 + -3.5 = 3.446221995 x = 3.446221995 Simplifying x = 3.446221995

Subproblem 2

x + 3.5 = -6.946221995 Simplifying x + 3.5 = -6.946221995 Reorder the terms: 3.5 + x = -6.946221995 Solving 3.5 + x = -6.946221995 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 = -6.946221995 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -6.946221995 + -3.5 x = -6.946221995 + -3.5 Combine like terms: -6.946221995 + -3.5 = -10.446221995 x = -10.446221995 Simplifying x = -10.446221995

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.446221995, -10.446221995}

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