exam Maths Puzzle Numerical Ability

Please help.
Factor the following polynomial completely.
-3s^2 - 10s + 8

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exam Other Question

For each function f, construct and simplify the difference quotient
f(x+h)-f(x)/h

f(x)= x/2-x Could use some hlp plz

find the leading coefficient of (5x-2)(4-9x)(4x+5)^2(5-2x)^3

thanks a million 4 your time