exam Maths Puzzle Numerical Ability

faxtor: 12w2+10w-8
factor 4k2+20k+25
factor: 16e2-4
factor: 3a2+9a+6

thank you for your help

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exam Other Question
If y varies as x and y=100 when x=10 and z=5, find y when x=12 and z=6.

Thanks log3(x-1)-log3(x+2)=2