book Maths Puzzle Numerical Ability

P(x)=2x^2-3x^2+4x-5

The P(1)=-2
P(2)=7 and
P(-1)=?

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book Other Question

write in simplest form 26/90

Should it be

26/90 = 2 times 13
3 times 3 times 2 times 5 equals 13/45
List all of the potential rational zeros of the polynomial function. Do not attempt to find the zeros.

f(x)=5x^3+2x^2-2x+5