y=x(x+1)(x+3)

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


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

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

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

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

Combine like terms: 1x + 3x = 4x
y = x(3 + 4x + x2)
y = (3 * x + 4x * x + x2 * x)
y = (3x + 4x2 + x3)

Solving
y = 3x + 4x2 + x3

Solving for variable 'y'.

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

Simplifying
y = 3x + 4x2 + x3

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