exam Maths Puzzle Numerical Ability

will you please help me with this: what is (12a+6/5a^2)(6/a+1)(5a+5/2a+1)

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exam Other Question

t^2-24-10t
(t+?)(t-?)
I have tried -10,1..-1,10..2,-5......5,-2...... I believe this is prime.
would you jsut check behind me please?
Thank you Dianne Need help solving