f(1.75)=3x(x-3)(x+4)

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Solution for f(1.75)=3x(x-3)(x+4) equation: 


Simplifying
f(1.75) = 3x(x + -3)(x + 4)

Reorder the terms for easier multiplication:
1.75f = 3x(x + -3)(x + 4)

Reorder the terms:
1.75f = 3x(-3 + x)(x + 4)

Reorder the terms:
1.75f = 3x(-3 + x)(4 + x)

Multiply (-3 + x) * (4 + x)
1.75f = 3x(-3(4 + x) + x(4 + x))
1.75f = 3x((4 * -3 + x * -3) + x(4 + x))
1.75f = 3x((-12 + -3x) + x(4 + x))
1.75f = 3x(-12 + -3x + (4 * x + x * x))
1.75f = 3x(-12 + -3x + (4x + x2))

Combine like terms: -3x + 4x = 1x
1.75f = 3x(-12 + 1x + x2)
1.75f = (-12 * 3x + 1x * 3x + x2 * 3x)
1.75f = (-36x + 3x2 + 3x3)

Solving
1.75f = -36x + 3x2 + 3x3

Solving for variable 'f'.

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

Divide each side by '1.75'.
f = -20.57142857x + 1.714285714x2 + 1.714285714x3

Simplifying
f = -20.57142857x + 1.714285714x2 + 1.714285714x3

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