Chapter 3 - Section 3.4 - Real Zeros of Polynomials - 3.4 Exercises - Page 284: 79

$-1,+3$

Possible rational zeros are $\pm1,\pm2$ a. Test upper bounds, we found $+2$ is not an upper bound, test $+3$ confirms it is an upper bound. b. Test lower bounds with values $-2,-1,0,...$ we found that $-1$ is a lower bound.