I need help with matrices
1 answer:
You might be interested in
Descartes' rule of signs tells you the one sign change in the coefficients means there's one positive real root. If you change the sign of the odd-power terms, the signs become -++-, so have two sign changes. This means there are 0 or 2 negative real roots.
A graph shows there to be 3 real roots, two of which are negative. Thus there are no complex roots.
A graph shows there to be 3 real roots, two of which are negative. Thus there are no complex roots.