Question

Evaluate the function f(r)= square root of r+1 -5 at the given values of the independent variable and simplify.a. f(-1) b. f(80) c. f(x-1)

Answer 1

$f(r)=\sqrt[]{r+1}-5$

a)

$\begin{gathered} f(-1)=\sqrt[]{-1+1}-5 \\ f(-1)=\sqrt[]{0}-5 \\ f(-1)=-5 \end{gathered}$

b)

$\begin{gathered} f(80)=\sqrt[]{80+1}-5 \\ f(80)=\sqrt[]{81}-5 \\ f(80)=9-5 \\ f(80)=4 \end{gathered}$

c)

$\begin{gathered} f(x-1)=\sqrt[]{(x-1)+1}-5 \\ f(x-1)=\sqrt[]{x}-5 \end{gathered}$