1.

If `y=y(x)`satisfies the differential equation `8sqrt(x)(sqrt(9+sqrt(x)))dy=(sqrt(4+sqrt(9+sqrt(x))))^(-1)dx ,x >0a n dy(0)=sqrt(7,)`then `y(256)=`16 (b)80 (c) 3(d) 9A. (a) 16B. (b) 3C. (c) 9D. (d) 80

Answer» Correct Answer - (b)
`dy/dx=1/(8sqrt(x)sqrt(9+sqrt(x))sqrt(4+sqrt(9+sqrt(x))))`
`rArr y= sqrt(4+sqrt9+sqrt(x))+c`
Now, `y(0)=sqrt(7)+c`
`rArr c=0`
`y(256)=sqrt(4+sqrt(9+16))=sqrt(4+5)=3`


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