[x+4][x+1]=

Solution for [x+4][x+1]= equation:

Simplifying
[x + 4][x + 1] = 0

Reorder the terms:
[4 + x][x + 1] = 0

Reorder the terms:
[4 + x][1 + x] = 0

Multiply [4 + x] * [1 + x]
[4[1 + x] + x[1 + x]] = 0
[[1 * 4 + x * 4] + x[1 + x]] = 0
[[4 + 4x] + x[1 + x]] = 0
[4 + 4x + [1 * x + x * x]] = 0
[4 + 4x + [1x + x2]] = 0

Combine like terms: 4x + 1x = 5x
[4 + 5x + x2] = 0

Solving
4 + 5x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(4 + x)(1 + x) = 0

Subproblem 1
Set the factor '(4 + x)' equal to zero and attempt to solve:

Simplifying
4 + x = 0

Solving
4 + x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-4' to each side of the equation.
4 + -4 + x = 0 + -4

Combine like terms: 4 + -4 = 0
0 + x = 0 + -4
x = 0 + -4

Combine like terms: 0 + -4 = -4
x = -4

Simplifying
x = -4
Subproblem 2
Set the factor '(1 + x)' equal to zero and attempt to solve:

Simplifying
1 + x = 0

Solving
1 + x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-1' to each side of the equation.
1 + -1 + x = 0 + -1

Combine like terms: 1 + -1 = 0
0 + x = 0 + -1
x = 0 + -1

Combine like terms: 0 + -1 = -1
x = -1

Simplifying
x = -1
Solution
x = {-4, -1}