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Question Number 185449 by Mastermind last updated on 22/Jan/23
Findthefirstfourtermsintheexpansionofx−3(1−x2)2(2+x2)inascendingpowerofx.M.m
Answered by mr W last updated on 22/Jan/23
−12(3−x)∑∞k=0C1k+1x2k∑∞r=0(−1)rx2r2rx0term:−32×1×1=−32✓x1term:−12×(−1)×1×1=12✓x2term:−32×{2×1+1×(−12)}=−94✓x3term:−12×(−1)×{2×1+1×(−12)}=34✓....
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