exam Maths Puzzle Numerical Ability

Determine the value/s of the variable where the expression is undefined :
-16 / j-3

Solve by factoring : x^2+3x+2

Factor Completely: 3x^3-3x^2-6x

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exam Other Question

I would apprecaite some help with the following :

Simplify

3(m^-3)^-2 nm^3n^-1 / mm^2m^0m^-7(m^3)^3
Perform the indicated operation

(6x^2+7x-8)-(-9x^2+10)

A)-3x^2+7x+2 B)15x^2+7x-18 C)15x^2-3x-8 D)-3x^2-3x-8