Maths Exam Numerical Ability

Find the maximum slope of the curve
f(x) = 2x + 3x^2 - x^3 - 27

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Maths Other Question

if,
4+5+2=201021
8+3+6=241869
9+7+1=630797
3+8+5=244064
then
7+2+5=?
reply with logic.
no of divisors of 1080 excluding throguhout divisors which are perfect squares?