b.
-yz²-xy²-zx²-(-yx²-zy²-xz²)=
-yz²-xy²-zx²+yx²+zy²+xz²=
yx²+zy²+xz²-yz²-xy²-zx²=
Le grupa 2 cate 2 convenabil, astfel
x²y-xy²-zx²+zy²+z²x-z²y=
xy(x-y)-z(x²-y²) + z²(x-y)=
xy(x-y)-z(x-y)(x+y) + z²(x-y)=
(x-y)(xy-zx-zy+z²)
d.
-2+0-2b-(-2+0-2a)=
-2-2b+2+2a=
2a-2b=2(a-b)
e.
=9α+0+0-(0+0-i²α)=9α-α=8α
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Verified answer
b.
-yz²-xy²-zx²-(-yx²-zy²-xz²)=
-yz²-xy²-zx²+yx²+zy²+xz²=
yx²+zy²+xz²-yz²-xy²-zx²=
Le grupa 2 cate 2 convenabil, astfel
x²y-xy²-zx²+zy²+z²x-z²y=
xy(x-y)-z(x²-y²) + z²(x-y)=
xy(x-y)-z(x-y)(x+y) + z²(x-y)=
(x-y)(xy-zx-zy+z²)
d.
-2+0-2b-(-2+0-2a)=
-2-2b+2+2a=
2a-2b=2(a-b)
e.
=9α+0+0-(0+0-i²α)=9α-α=8α