Chapter 2 - Functions - Review Exercises and Problems for Chapter Two - Page 109: 7

(a) $f(0)=1$ (b) $x=-0.5$

(a) Using $x=0$ yields a value of $f(0)=2(0)+1=1$. (b) Using the fact that $f(x)=0$ yields the equation $$2x+1=0$$ Subtract $1$ from both sides to get $$2x=-1$$ Divide both sides by $2$ to get a solution of $$x=-0.5$$