If f: A➡️B and G: B➡️C are bijective mapping then (gof)-¹ = f-¹ og -¹
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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
Answer:
5int 8526234234546456