f(x)=x(x-1.4)(x+2.1)

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Solution for f(x)=x(x-1.4)(x+2.1) equation: 


Simplifying
f(x) = x(x + -1.4)(x + 2.1)

Multiply f * x
fx = x(x + -1.4)(x + 2.1)

Reorder the terms:
fx = x(-1.4 + x)(x + 2.1)

Reorder the terms:
fx = x(-1.4 + x)(2.1 + x)

Multiply (-1.4 + x) * (2.1 + x)
fx = x(-1.4(2.1 + x) + x(2.1 + x))
fx = x((2.1 * -1.4 + x * -1.4) + x(2.1 + x))
fx = x((-2.94 + -1.4x) + x(2.1 + x))
fx = x(-2.94 + -1.4x + (2.1 * x + x * x))
fx = x(-2.94 + -1.4x + (2.1x + x2))

Combine like terms: -1.4x + 2.1x = 0.7x
fx = x(-2.94 + 0.7x + x2)
fx = (-2.94 * x + 0.7x * x + x2 * x)
fx = (-2.94x + 0.7x2 + x3)

Solving
fx = -2.94x + 0.7x2 + x3

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -2.94 + 0.7x + x2

Simplifying
f = -2.94 + 0.7x + x2

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