Subject
Bank Exam
Topic
Modhumoti Bank Ltd. - Probationary Officer - 2016
If x + y = 7 and x2+ y2= 25, then which one of the following equals the value of x3+ y3?
If x + y = 7 and x2+ y2= 25, then which one of the following equals the value of x3+ y3?
ক)
25খ)
35গ)
65ঘ)
91Explanation
Solution: দেয়া আছে, x 2 + y 2 = 25 => x 2 + y 2 = 25 => (x + y) 2 - 2xy = 25 => 7 2 - 2xy = 25 => 2xy = 24 xy = 12 x 3 + y 3 = (x + y) 3 - 3xy (x + y) = 7 - 3 12 7 = 343 - 252 = 91Related questions
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