Chapter 6 - Review - Page 404: 60

$P(-5)=-9,323$

Substituting $x$ with $ -5 $ in the given polynomial equation, $P(x)=3x^5-9x+7,$ then, \begin{array}{l}\require{cancel} P(-5)=3(-5)^5-9(-5)+7 \\\\ P(-5)=3(-3,125)-9(-5)+7 \\\\ P(-5)=-9375+45+7 \\\\ P(-5)=-9,323 .\end{array}