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Question

If the point (α,α2) lies on or inside the triangle formed by the lines x2y+xy22xy=0, then the largest possible value of α is

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Solution

x2y+xy22xy=0
(xy)(x+y)2xy=0
xy(x+y2)=0

Point lies on or inside the triangle formed by the lines
x=0,y=0 and x+y=2
Required conditions are
(i) α0 (ii) α20
(iii) α+α220

α[0,1]

So, largest value of α=1

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