y=(1+0.05x)(4000-80x)

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Solution for y=(1+0.05x)(4000-80x) equation: 


Simplifying
y = (1 + 0.05x)(4000 + -80x)

Multiply (1 + 0.05x) * (4000 + -80x)
y = (1(4000 + -80x) + 0.05x * (4000 + -80x))
y = ((4000 * 1 + -80x * 1) + 0.05x * (4000 + -80x))
y = ((4000 + -80x) + 0.05x * (4000 + -80x))
y = (4000 + -80x + (4000 * 0.05x + -80x * 0.05x))
y = (4000 + -80x + (200x + -4x2))

Combine like terms: -80x + 200x = 120x
y = (4000 + 120x + -4x2)

Solving
y = 4000 + 120x + -4x2

Solving for variable 'y'.

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

Simplifying
y = 4000 + 120x + -4x2

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