[tex](2k^2-1)(2k+1)=4k^3+2k^2-2k-1[/tex]
Wykorzystany wzór:
[tex](a \± b) \cdot (c\±d)=a \cdot c \± a \cdot d \± b \cdot c \± b \cdot d[/tex]
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[tex](2k^2-1)(2k+1)=4k^3+2k^2-2k-1[/tex]
Wykorzystany wzór:
[tex](a \± b) \cdot (c\±d)=a \cdot c \± a \cdot d \± b \cdot c \± b \cdot d[/tex]