(x+3)(x+4)=(10)(4)

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Solution for (x+3)(x+4)=(10)(4) equation:


Simplifying
(x + 3)(x + 4) = (10)(4)

Reorder the terms:
(3 + x)(x + 4) = (10)(4)

Reorder the terms:
(3 + x)(4 + x) = (10)(4)

Multiply (3 + x) * (4 + x)
(3(4 + x) + x(4 + x)) = (10)(4)
((4 * 3 + x * 3) + x(4 + x)) = (10)(4)
((12 + 3x) + x(4 + x)) = (10)(4)
(12 + 3x + (4 * x + x * x)) = (10)(4)
(12 + 3x + (4x + x2)) = (10)(4)

Combine like terms: 3x + 4x = 7x
(12 + 7x + x2) = (10)(4)

Multiply 10 * 4
12 + 7x + x2 = 40

Solving
12 + 7x + x2 = 40

Solving for variable 'x'.

Reorder the terms:
12 + -40 + 7x + x2 = 40 + -40

Combine like terms: 12 + -40 = -28
-28 + 7x + x2 = 40 + -40

Combine like terms: 40 + -40 = 0
-28 + 7x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '28' to each side of the equation.
-28 + 7x + 28 + x2 = 0 + 28

Reorder the terms:
-28 + 28 + 7x + x2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + 7x + x2 = 0 + 28
7x + x2 = 0 + 28

Combine like terms: 0 + 28 = 28
7x + x2 = 28

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 = 28 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 28 + 12.25

Combine like terms: 28 + 12.25 = 40.25
12.25 + 7x + x2 = 40.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 40.25

Calculate the square root of the right side: 6.34428877

Break this problem into two subproblems by setting 
(x + 3.5) equal to 6.34428877 and -6.34428877.

Subproblem 1

x + 3.5 = 6.34428877 Simplifying x + 3.5 = 6.34428877 Reorder the terms: 3.5 + x = 6.34428877 Solving 3.5 + x = 6.34428877 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 = 6.34428877 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 6.34428877 + -3.5 x = 6.34428877 + -3.5 Combine like terms: 6.34428877 + -3.5 = 2.84428877 x = 2.84428877 Simplifying x = 2.84428877

Subproblem 2

x + 3.5 = -6.34428877 Simplifying x + 3.5 = -6.34428877 Reorder the terms: 3.5 + x = -6.34428877 Solving 3.5 + x = -6.34428877 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 = -6.34428877 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -6.34428877 + -3.5 x = -6.34428877 + -3.5 Combine like terms: -6.34428877 + -3.5 = -9.84428877 x = -9.84428877 Simplifying x = -9.84428877

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.84428877, -9.84428877}

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