Answer
(a) $(8,3)$
(b) $(8,48)$
Work Step by Step
(a) As $\frac{1}{4}f(x)$ can be obtained by shrinking $f(x)$ vertically by a factor of 4, we can obtain the corresponding point of $(8,12)$ as $(8,3)$
(b) As $4f(x)$ can be obtained by stretching $f(x)$ vertically by a factor of 4, we can obtain the corresponding point of $(8,12)$ as $(8,48)$
