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Chapter ---- Straight Lines. Please answer this question...!!!

Chapter ---- Straight Lines. 
Please answer this question...!!!

Question Image
Grade:11

1 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
2 years ago
Dear Student

Please factorize the terms
L1L2 = x^2 + 3xy-xy +ay^2
= (x(x+3y))-y((x-ay))
putting a =-3
= (x-y)(x+3y)

L1L3= a​x^2 + 3xy-xy +y^2
= (y(3x+y))-x((y-ax))
putting a =-3
= -1*(x-y)(3x+y)

L2L3 = (x+3y)(3x+y)
= 3x^2 + 10xy + 3y^2

​option B
Regards

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