exam Maths Puzzle Numerical Ability

PLEASE I NEED HELP ON THIS PROBLEMS: (3X^2-6)^2=

X^4-16=

(X+7)(X+9)=

X^2+14X+33=

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exam Other Question

simplifly the following :


1) 3x^3 y^4 z^-2 / 6x^-1 y^3 z^-3



2)36^1/2 / 15^2
Evaluate if possible.

the square root of -4