exam Maths Puzzle Numerical Ability

subtract an write in simplest form

y-2
over
y+3
subtracted from
y
over
2y+6

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exam Other Question

Please help me with question. I do not understand it at all. Thanks so much for your help.

Find the indicated outputs for f(x)=2xto the second power -2x
f(0)=
f(-1)=
f(2)=

thanks again for the help.
find all roots of the polynomial x3 - x2 +16x -16

possible answers:
1, 4, -4
-1, 4, -4
-1, 4i, -4i
1, 4i, -4i

what does the i come from? please explain equation and solution.Thank you