Subject
Bank Exam
Topic
জনতা ব্যাংক পিএলসি [অফিসার (রুরাল ক্রেডিট)] - ১৮.০৭.২০২৫
If 3x + (3/x) = 5, then x3+ (1/x3) = ?
If 3x + (3/x) = 5, then x3+ (1/x3) = ?
ক)
260/27খ)
85/27গ)
-(10/27)ঘ)
-(90/27)Explanation
দেয়া আছে, 3x + (3/x) = 5 বা, x + (1/x) = 5/3 ∴ x 3 + (1/x) 3 = {x + (1/x)} 3 - 3.x.(1/x){x + (1/x)} = (5/3) 3 - 3 × (5/3) = (125/27) - 5 = (125 - 135)/27 = - (10/27)Related questions
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