y=x(x+5)(x+4)

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Solution for y=x(x+5)(x+4) equation: 


Simplifying
y = x(x + 5)(x + 4)

Reorder the terms:
y = x(5 + x)(x + 4)

Reorder the terms:
y = x(5 + x)(4 + x)

Multiply (5 + x) * (4 + x)
y = x(5(4 + x) + x(4 + x))
y = x((4 * 5 + x * 5) + x(4 + x))
y = x((20 + 5x) + x(4 + x))
y = x(20 + 5x + (4 * x + x * x))
y = x(20 + 5x + (4x + x2))

Combine like terms: 5x + 4x = 9x
y = x(20 + 9x + x2)
y = (20 * x + 9x * x + x2 * x)
y = (20x + 9x2 + x3)

Solving
y = 20x + 9x2 + x3

Solving for variable 'y'.

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

Simplifying
y = 20x + 9x2 + x3

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