40=(x+1)(3x+1)

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Solution for 40=(x+1)(3x+1) equation: 


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

Reorder the terms:
40 = (1 + x)(3x + 1)

Reorder the terms:
40 = (1 + x)(1 + 3x)

Multiply (1 + x) * (1 + 3x)
40 = (1(1 + 3x) + x(1 + 3x))
40 = ((1 * 1 + 3x * 1) + x(1 + 3x))
40 = ((1 + 3x) + x(1 + 3x))
40 = (1 + 3x + (1 * x + 3x * x))
40 = (1 + 3x + (1x + 3x2))

Combine like terms: 3x + 1x = 4x
40 = (1 + 4x + 3x2)

Solving
40 = 1 + 4x + 3x2

Solving for variable 'x'.

Combine like terms: 40 + -1 = 39
39 + -4x + -3x2 = 1 + 4x + 3x2 + -1 + -4x + -3x2

Reorder the terms:
39 + -4x + -3x2 = 1 + -1 + 4x + -4x + 3x2 + -3x2

Combine like terms: 1 + -1 = 0
39 + -4x + -3x2 = 0 + 4x + -4x + 3x2 + -3x2
39 + -4x + -3x2 = 4x + -4x + 3x2 + -3x2

Combine like terms: 4x + -4x = 0
39 + -4x + -3x2 = 0 + 3x2 + -3x2
39 + -4x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
39 + -4x + -3x2 = 0

Factor a trinomial.
(3 + -1x)(13 + 3x) = 0


Subproblem 1
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

Subproblem 2
Set the factor '(13 + 3x)' equal to zero and attempt to solve:

Simplifying
13 + 3x = 0

Solving
13 + 3x = 0

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

Add '-13' to each side of the equation.
13 + -13 + 3x = 0 + -13

Combine like terms: 13 + -13 = 0
0 + 3x = 0 + -13
3x = 0 + -13

Combine like terms: 0 + -13 = -13
3x = -13

Divide each side by '3'.
x = -4.333333333

Simplifying
x = -4.333333333
Solution
x = {3, -4.333333333}

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