Consider limx$$e$7$x$-$x$2.$

a$)$ limx$$$7$x$-$x$2=$Correct $$

Part $2$ of $3$

b$)$ If we let t$=7$x$-$x$2,$ then we can rewrite the original limit as

$$lim $7$x$$x$2$Incorrect $$ xIncorrect $$Correct $$