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Question

If the equation λx2+4y+y2+λx+3y+2=0 represent a parabola then find λ ?

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Solution

comparing with ax2+2hxy+by2+2gx+2fy+c=0
h=2;a=λandb=1
so for parabola
b24ac=0
so16=8λ
λ=2

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