exam Maths Puzzle Numerical Ability

Given f(x)=3^x, which statement is true?
a) f(x+y)=f(x)+(y)
b) f(x+y)=f(x)f(y)
c) f(xy)=f(x)+f(y)
d) f(x/y)=f(x-y)

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exam Other Question

how are the expressions 3 to the 4th power and 4 to the 3rd power diffrent?? if f(x)=log((1+x)/(1-x))then prove that 2f(x)=f((2x)/1+x2))
sir x2 is x squre