Subject
Bank Exam
Topic
২০২১ সাল ভিত্তিক সমন্বিত ০৭ ব্যাংক (অফিসার ক্যাশ/টেলর) - ২৪.০৫.২০২৪
If x = a + (1/a) and y = a - (1/a) then x4+ y4- 2x2y2= ?
If x = a + (1/a) and y = a - (1/a) then x4+ y4- 2x2y2= ?
ক)
4খ)
8গ)
16ঘ)
None of theseExplanation
দেওয়া আছে, x = a + 1/a y = a - 1/a x + y = a + (1/a) + a - (1/a) = 2a x - y = a + (1/a) - a + (1/a) = 2/a এখন, x 4 + y 4 - 2x 2 y 2 = (x 2 ) 2 + (y 2 ) 2 - 2.x 2 .y 2 = (x 2 - y 2 ) 2 = {(x + y)(x - y)} 2 = {(2a)(2/a)} 2 = 4 2 = 16Related questions
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