Suppose that a and b are positive real numbers, and let
f(x) = ax if x = -4
f(x) = bx if x > -4
If f(-4)=-\frac{60}{13} and f(4)=3120, what is a+b?
If f(x)=ax when x=-4, then...
-60/13 = a * -4
15/13 = a
If f(x)=bx when x>-4, then...
3120=b * 4
780 = b
So, a+b = 15/13 + 780 = 10155/13.
