Doprowadź do najprostszej postaci i oblicz wartość dla
a)z=1
b)z=jedna trzecia
7(z^-2)-4(z+3)(z-3)=
7(z²-2)-4(z+3)(z-3)=
=7z²-14-4(z²-9)=
=7z²-14-4z²+36=
=3z²+22
a) gdy z=1
3*1²+22=3+22=25
b)gdy z=⅓
3*(⅓)²+22=3*1/9+22=⅓+22=22⅓
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7(z²-2)-4(z+3)(z-3)=
=7z²-14-4(z²-9)=
=7z²-14-4z²+36=
=3z²+22
a) gdy z=1
3*1²+22=3+22=25
b)gdy z=⅓
3*(⅓)²+22=3*1/9+22=⅓+22=22⅓