exam Maths Puzzle Numerical Ability

How can I rewrite this problem as a single logarithm: 7lnx + 4lny -3lnz

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exam Other Question

find the domain of x-2y=1 if the range is (-2,0,5,8) Solve for x:2 to the power of x^2 -5x = 8
Please show steps
Thank you:)

Hey thanks for trying I truly do appreciate it however the answer is

x = 5 plus/minus √37 /(2)

Can someone correct this?