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x²(x-20-(x-2)=0
(x²-1)(x-2)=0
(x-1)(x+1)(x-20=0 B
x=1 x= -1 x=2
10)
x³+2x²-4x-8≥0
x²(x+2)-4(x+2) ≥0
(x² -4)(x+2) ≥0
(x-2)(x+2)(x+2) ≥0
x=2 x -2 A
zad. 11
a1=n²+3\n-1=1²+3\1-1=4\0=0
a3=3²+3\3-1=12\2=6
mam nadzieje że o te (a) chodzi bo ostatnie zad. bardzo słabo widać