more polynomials (1 Viewer)

[243_robbo]

ok in this example, why in part 3 do they substitute their value into the result from part 2 and not the original polynomial

 

[acullen]

In part b, the roots are 1/alpha, 1/beta, 1/gamma; and in part c, the roots are a/alpha, a/beta and a/gamma where a=-3. They're just writing it that way as the roots are scalar multiples of each other and they are demonstrating the relation (atleast that's my guess).

 

[Nodice]

Yep, all related.

 

[shsshs]

you could sub in -3/x into the original equation

but they chose to sub -x/3 into the 2nd one.. coz its roots are the reciprical of part a