f(x)=x*(60-2x)*(15-2x)

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Solution for f(x)=x*(60-2x)*(15-2x) equation: 


Simplifying
f(x) = x(60 + -2x)(15 + -2x)

Multiply f * x
fx = x(60 + -2x)(15 + -2x)

Multiply (60 + -2x) * (15 + -2x)
fx = x(60(15 + -2x) + -2x * (15 + -2x))
fx = x((15 * 60 + -2x * 60) + -2x * (15 + -2x))
fx = x((900 + -120x) + -2x * (15 + -2x))
fx = x(900 + -120x + (15 * -2x + -2x * -2x))
fx = x(900 + -120x + (-30x + 4x2))

Combine like terms: -120x + -30x = -150x
fx = x(900 + -150x + 4x2)
fx = (900 * x + -150x * x + 4x2 * x)
fx = (900x + -150x2 + 4x3)

Solving
fx = 900x + -150x2 + 4x3

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 900 + -150x + 4x2

Simplifying
f = 900 + -150x + 4x2

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