exam Maths Puzzle Numerical Ability

slove algebraically log base 4 (x+41)- log base 4(2x-5)=2

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exam Other Question

Find the first five outputs of the following recursively defined function:

f(1)=8,(thats given) f(n+1)=-f(n)+6

its not really a permutation but i didnt know what category to put it in
How do you solve this equation:

a(square)+ 2ab - c(square) - c (square) - 2cd - d (square)

I have typed (square) to suggest a to the power of 2.