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Поезд в течение 10 с увеличил скорость с 10 до 15 м/с.    В течение следующих 0,3 мин он двигался равномерно. Построить график скорости.​

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If x2 + y2/x2 – y2 = 17/8 then find the value of :

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asked Feb 21, 2019 in Class X Maths by navnit40 Expert (40.5k points)

If x2 + y2/x2 – y2 = 17/8, then find the value of :

(i) x : y

(ii) x3 + y3/x3 – y3

ratio and proportion

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answered Feb 21, 2019 by aditya23 Expert (73.7k points)

(i) x2 + y2/x2 – y2 = 17/8

Applying componendo and dividendo rule,

x2 + y2 + x2 – y2/x2 + y2 – x2 + y2 = 17 + 8/17 – 8

2x2/2y2 = 25/9

x2/y2 = 25/9

x/y = 5/3

x : y = 5 : 3

(ii) Taking cube on both sides,

x3/y3 = 125/27

Applying componendo and dividendo rule,

x3 + y3/x3 – y3 = 125 + 27/125 – 27

x3 + y3/x3 – y3 = 152/98