(x+1)(x+3)=8x

Solution for (x+1)(x+3)=8x equation:

Simplifying
(x + 1)(x + 3) = 8x

Reorder the terms:
(1 + x)(x + 3) = 8x

Reorder the terms:
(1 + x)(3 + x) = 8x

Multiply (1 + x) * (3 + x)
(1(3 + x) + x(3 + x)) = 8x
((3 * 1 + x * 1) + x(3 + x)) = 8x
((3 + 1x) + x(3 + x)) = 8x
(3 + 1x + (3 * x + x * x)) = 8x
(3 + 1x + (3x + x2)) = 8x

Combine like terms: 1x + 3x = 4x
(3 + 4x + x2) = 8x

Solving
3 + 4x + x2 = 8x

Solving for variable 'x'.

Reorder the terms:
3 + 4x + -8x + x2 = 8x + -8x

Combine like terms: 4x + -8x = -4x
3 + -4x + x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
3 + -4x + x2 = 0

Factor a trinomial.
(1 + -1x)(3 + -1x) = 0

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

Simplifying
1 + -1x = 0

Solving
1 + -1x = 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 + -1x = 0 + -1

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

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

Divide each side by '-1'.
x = 1

Simplifying
x = 1
Subproblem 2
Set the factor '(3 + -1x)' equal to zero and attempt to solve:

Simplifying
3 + -1x = 0

Solving
3 + -1x = 0

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

Add '-3' to each side of the equation.
3 + -3 + -1x = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -1x = 0 + -3
-1x = 0 + -3

Combine like terms: 0 + -3 = -3
-1x = -3

Divide each side by '-1'.
x = 3

Simplifying
x = 3
Solution
x = {1, 3}