ax^2+bx+c=0 সমীকরণটির একটি বীজ অপরটির দ্বিগুন হলে, দেখাও যে, 2b^2=9ac
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ax2- bx + c = 0
ধরি, একটি বীজ = α অপরটি হল = 2α
আমরা জানি, α + 2α = –
b
a
বা, α = –
b
3a
এখন, α. 2α =
বা, 2b²= 9ac (Proved)
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