Question

what is the indicated operation of (f-g)(-9) when f= 2x-1 and g= x+4

Answer 1

Given:

$\begin{gathered} f=2x-1 \\ g=x+4 \end{gathered}$$\begin{gathered} (f-g)(-9)=f(-9)-g(-9)) \\ (f-g)(-9)=2(-9)-1-\lbrack-9+4\rbrack \\ (f-g)(-9)=-18-1-\lbrack-5\rbrack \\ (f-g)(-9)=-19+5 \\ (f-g)(-9)=-14 \end{gathered}$