Answer:
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Step-by-step explanation:
The fundamental theorem of algebra states that a polynomial with degree n has at most n solutions. The "at most" depends on the fact that the solutions might not all be real number.
In fact, if you use complex number, then a polynomial with degree n has exactly n roots.
So, in particular, a third-degree polynomial can have at most 3 roots.
In fact, in general, if the polynomial
has solutions
, then you can factor it as

So, a third-degree polynomial can't have 4 (or more) solutions, because otherwise you could write it as

But this is a fourth-degree polynomial.
Any number less than or equal to 12
You can multiply the equation in any order.
2[-3/9]=[-3/9]2
Commutative Property of Multiplication

means there exists an integer

such that

. We can divide both sides by

because

. This implies

for some integer, which is identically

.