book Maths Puzzle Numerical Ability

The 3rd equation was stated there it is

f(2)=-1/2

I completed the first part of each of the functions but got stuck with the elimination part....please help

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book Other Question

How do you factor this?

y/y+2 - 1/Y^2+2y
It is possible for a triangle to be which of the following?

A) both isosceles and right
B) both equilateral and equiangular
C) both scalene and acute
D) both obtuse and equilateral