9x2-25y2 এবং 15ax-25ay এর ল.সা.গু. কত?

A 3x+5y

B 3x-5y

C 9x2-25y2

D 5a(9x2-25y2)

Solution

Correct Answer: Option D

১ম রাশি = 9x2-25y2 = (3x)2 - (5y)2 = (3x+5y)(3x-5y)

২য় রাশি = 15ax-25ay = 5a(3x-5y) 

∴ ল.সা.গু. = 5a(3x+5y)(3x-5y) = 5a(9x2-25y2)

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