1.

The degree and order of the differential equation of the family of all parabolas whose axis is x-axs are respectivelyA. 2,1B. 1,2C. 3,2D. none of these

Answer» Correct Answer - B
The equation of all parabolas whose axis is x-axis is given by `y^(2)=4a(x-h)`
Differentiating w.r. to x, we get
`2yy_(1)=4a rArr yy_(1)=2a rArr y_(1)^(2)+yy_(2)=0`
This is a differential equation of order 2 and degree 1.


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