Rewriting expressions to logarithms?

Question

 

Rewrite the expression

f(x)= ln ( x^2-25/x^4)

using properties of logarithms

Answer 1

f(x)=ln((x^2-25)/x^4)=ln(((x-5)/x^2)(x+5)/x^2))=ln(x-5)-2ln(x)+ln(x+5)-2ln(x) or ln(x-5)+ln(x+5)-4ln(x).