Question

Is there a specific way of solving cubic equations, apart from guessing factors?

Answer 1

what do u mean by guessing factors

Answer 2

\[as \in if you want \to solve -x^{3}+12x+16, you try (x-1),(x-2) etc\]

Answer 3

Cardano's formula ...

Answer 4

The possible rational roots are the factors of the constant term divided by the factors of the coefficient of the cubic term. Use synthetic division to see if any of those numbers are roots.

Answer 5

woah Cardano's method seems complicated

Answer 6

Just do what I said. It is pretty easy.

Answer 7

ok let me try that...Thanks

Answer 8

If you post an equation I could help you.

Answer 9

yeah ok let me do that

Answer 10

\[-x ^{3}+12x+16=0\]

Answer 11

Possible rational roots:

\[\pm1, \pm2,\pm 4, \pm8, \pm16\]

Answer 12

ok so how did you get those numbers?

Answer 13

ow so the factors of 12 and the factors of 16

Answer 14

yeah I get it