Find $\lim _ { x \rightarrow + \infty } f ( x )$

Short Answer

Find $\lim _ { x \rightarrow + \infty } f ( x )$ and $\lim _ { x \rightarrow - \infty } f ( x )$ . If the limiting value is infinite indicate whether it is + $\infty$ or - $\infty$ .f (x) = (4 - x)(x + 5)