y=(x+1)(x+4)

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Solution for y=(x+1)(x+4) equation: 


Simplifying
y = (x + 1)(x + 4)

Reorder the terms:
y = (1 + x)(x + 4)

Reorder the terms:
y = (1 + x)(4 + x)

Multiply (1 + x) * (4 + x)
y = (1(4 + x) + x(4 + x))
y = ((4 * 1 + x * 1) + x(4 + x))
y = ((4 + 1x) + x(4 + x))
y = (4 + 1x + (4 * x + x * x))
y = (4 + 1x + (4x + x2))

Combine like terms: 1x + 4x = 5x
y = (4 + 5x + x2)

Solving
y = 4 + 5x + x2

Solving for variable 'y'.

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

Simplifying
y = 4 + 5x + x2

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