Question

According to Descartes Rule, how many positive real roots would the polynomial 5x4 + 3x3 - 7x2 + x - 3 have?
Answer
3 or 1 positive real roots
3 positive real roots
5 positive real roots
3 and 5 positive real roots

Answer 1

3 or 1 positive real roots. there are 3 sign changes. I dun even know of this rule, had to read it up on wiki. Lol. What are u studying.