exam Maths Puzzle Numerical Ability

Please help me to solve:

Facot each polynomial, if prime, say no.

18z+45+z^2

Thank you

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exam Other Question

y=-2x-1
y=3x-16

-2x-1=3x-16
-1=5x-16
15=5x
3=x

y=-2(3)-1
y=-6-5
y=-11 name of set or sets of a number to which the real number 21/3