Question 1074921
The expanded function {{{y=g(x)}}} is {{{y=g(x)=2*f(x)}}} .
for every x, {{{g(x)=2*f(x)}}} ,
so the points with {{{f(x)>0}}} are twice as high above the x-axis,
and the points with {{{f(x)<0}}} are twice as low below the x-axis.
The graph has been stretched vertically to twice as long
(while still firmly nailed at the points on the x-axis, if any).