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3*(-1)+1=-3+1=-2
b) 5-2y dla y=1
5-2*1=5-2=3
c) a(2a+1) dla a=1
1(2+1)=1*3=3
d) s do potegi 2 -1 dla s=-3
s^2 -1 = -3^2-1=9-1=8
b)5-2*1=5-2=3
c)1(2*1+1)=1*3=3
d)-3 do potęgi 2-1=-3 do pot. -1 = -3
5-2y=5-2*1=3
a(2a+1)=1*(2*1+1)=3
nie wiem jaki znak po tym s