Book Maths Puzzle Ratio and Proportion

The roots of the equation px²+qx+q=0 are in the ratio m: n.
Prove that √m/n+√n/m+√q/p=0

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Book Other Question

Please tell me how to rearrange this:

-0.17955/r^2 = -0.17955/(r+0.25)^2

into the quadratic formula ax^2 + bx + c = 0

Thanks
The perimeter of a triangle is 195mm. If the lengths of the sides are consecutive odds intergers, how do I find the length of each side?