if 5y + 1/5y = 6, find 5y - 1/5y.

5y+15y = 6Squaring both sides we get;5y+15y2 = 6225y2+125y2+2 = 3625y2+125y2 = 34 .......(i)
Now we have;
5y-15y2= 25y2+125y2-2= 34-2                    {Using (i)}= 32
So, 5y-15y = 32 = 42

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