exam Maths Puzzle Numerical Ability

how do you write this as a single logarithm?
4/3In(x^2-1)+2In(x+2)-1/3In(x-4)
thank you

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exam Other Question

write the equation of the line with slope 5 and y-intercept (0,-3)

thanks for the help A toy is assembled from 3 parts.If the probability that each part is defected is 0.1.Calculate the probability that the toy is defective.