2) (0,3b³+x)*(0,3b³-x)= 9/100b⁶-x²
4) (21d²-k³)*(21d²+k³)= (21d²)²-(k³)²=441d⁴-k⁶
6) (1,9c⁴+6d)(6d-1,9c⁴)=(6d+1,9c⁴)(6d-1,9c⁴)=36d²-1,9²*c⁸=36d²-361/100c⁸
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Answers & Comments
2) (0,3b³+x)*(0,3b³-x)= 9/100b⁶-x²
4) (21d²-k³)*(21d²+k³)= (21d²)²-(k³)²=441d⁴-k⁶
6) (1,9c⁴+6d)(6d-1,9c⁴)=(6d+1,9c⁴)(6d-1,9c⁴)=36d²-1,9²*c⁸=36d²-361/100c⁸