Podane wyrażenia przedstaw w postaci sum algebraicznych: (k+2) do potęgi 2 (3x+1) do potęgi 2
(k+2)²=(k+2)*(k+2)=k²+2k+2k+4=k²+4k+4
(3x-1)²=(3x-1)*(3x-1)=9x²-3x-3x+1=9x²-6x+1
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(k+2)²=(k+2)*(k+2)=k²+2k+2k+4=k²+4k+4
(3x-1)²=(3x-1)*(3x-1)=9x²-3x-3x+1=9x²-6x+1