Suppose our roots are [a, b, c]. We want a polynomial which
is zero when x is any of these values. The trivial polynomial
x-a is zero when x=a, so the product (x-a)(x-b)(x-c)
will do the job. We can use `a c x` to write this in a more
familiar form.

1: 34 x - 24 x^3 1: [1.19023, -1.19023, 0] . . r 2 a P x RET

1: [x - 1.19023, x + 1.19023, x] 1: (x - 1.19023) (x + 1.19023) x . . V M ' x-$ RET V R *

1: x^3 - 1.41666 x 1: 34 x - 24 x^3 . . a c x RET 24 n * a x

Sure enough, our answer (multiplied by a suitable constant) is the same as the original polynomial.

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