15(x+4)=(x-1)(x+4)

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Solution for 15(x+4)=(x-1)(x+4) equation: 


Simplifying
15(x + 4) = (x + -1)(x + 4)

Reorder the terms:
15(4 + x) = (x + -1)(x + 4)
(4 * 15 + x * 15) = (x + -1)(x + 4)
(60 + 15x) = (x + -1)(x + 4)

Reorder the terms:
60 + 15x = (-1 + x)(x + 4)

Reorder the terms:
60 + 15x = (-1 + x)(4 + x)

Multiply (-1 + x) * (4 + x)
60 + 15x = (-1(4 + x) + x(4 + x))
60 + 15x = ((4 * -1 + x * -1) + x(4 + x))
60 + 15x = ((-4 + -1x) + x(4 + x))
60 + 15x = (-4 + -1x + (4 * x + x * x))
60 + 15x = (-4 + -1x + (4x + x2))

Combine like terms: -1x + 4x = 3x
60 + 15x = (-4 + 3x + x2)

Solving
60 + 15x = -4 + 3x + x2

Solving for variable 'x'.

Reorder the terms:
60 + 4 + 15x + -3x + -1x2 = -4 + 3x + x2 + 4 + -3x + -1x2

Combine like terms: 60 + 4 = 64
64 + 15x + -3x + -1x2 = -4 + 3x + x2 + 4 + -3x + -1x2

Combine like terms: 15x + -3x = 12x
64 + 12x + -1x2 = -4 + 3x + x2 + 4 + -3x + -1x2

Reorder the terms:
64 + 12x + -1x2 = -4 + 4 + 3x + -3x + x2 + -1x2

Combine like terms: -4 + 4 = 0
64 + 12x + -1x2 = 0 + 3x + -3x + x2 + -1x2
64 + 12x + -1x2 = 3x + -3x + x2 + -1x2

Combine like terms: 3x + -3x = 0
64 + 12x + -1x2 = 0 + x2 + -1x2
64 + 12x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
64 + 12x + -1x2 = 0

Factor a trinomial.
(16 + -1x)(4 + x) = 0


Subproblem 1
Set the factor '(16 + -1x)' equal to zero and attempt to solve:

Simplifying
16 + -1x = 0

Solving
16 + -1x = 0

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

Add '-16' to each side of the equation.
16 + -16 + -1x = 0 + -16

Combine like terms: 16 + -16 = 0
0 + -1x = 0 + -16
-1x = 0 + -16

Combine like terms: 0 + -16 = -16
-1x = -16

Divide each side by '-1'.
x = 16

Simplifying
x = 16

Subproblem 2
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
Solution
x = {16, -4}

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