Question

How many sign changes are in the polynomial f(x) = 3x3 - 7x2 - 9x + 1

Answer 1

\[+3x ^{3} - 7x ^{2} - 9x + 1\] Therefore, there would be 3 sign changes.

Answer 2

2 I mean

Answer 3

how would did you do that

Answer 4

It goes + - - + So you start at + and go to -, that is one sign change. Then - to -, that is the same so no sign change. Finally - to + which is a sign change therefore you have 2 sign changes.