(x^7-x^5)(x^3+x^2)
to będzie
x^21+x^14-x^15-x^10
czy
x^10+x^9-x^8-x^7
czy jeszcze jakoś inaczej?
(x^7-x^5)(x^3+x^2) = x^10 + x^9 - x^8 - x^7
bo:
x^7 * x^3 = x^(7 + 3) = x^10
x^7 * x^2 = x^(7 + 2) = x^9
itd
(x^7-x^5)(x^3+x^2)=x^10+x^9-x^8-x^7
bo
a^x*a^y=a^(x+y)
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(x^7-x^5)(x^3+x^2) = x^10 + x^9 - x^8 - x^7
bo:
x^7 * x^3 = x^(7 + 3) = x^10
x^7 * x^2 = x^(7 + 2) = x^9
itd
(x^7-x^5)(x^3+x^2)=x^10+x^9-x^8-x^7
bo
a^x*a^y=a^(x+y)