exam Maths Puzzle Numerical Ability

Please help me anyone with this question. I have triedm it over and over again and it is just getting confusing. PLEASE HELP ME!!!!!!

1)x^2-12x+32/x^2-6x-16/x^2-x-12/x^2-5x-24

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exam Other Question

what is the answer to msquare+4m-21
problem: log (base 2) 35
This is what I have done:
log (base 2) (5 x 7)
log (base 2) 5 + log (base 2) 7
I do not know how to find the log base of 2 and the 5, and same for the base 2 and 7. On my TI-84 plus.