Question 682825
f(x)=ax^2+2a


f(3)=a(3)^2+2a


f(3)=a*9+2a


f(3)=9a+2a


f(3)=11a


------------------------


f(x)=ax^2+2a


f(1)=a(1)^2+2a


f(1)=a*1+2a


f(1)=1a+2a


f(1)=3a


------------------------


f(3)-f(1)=60


11a - 3a = 60


8a = 60


a = 60/8


a = <font color="red">15/2</font>