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1 Answer

5(x²+9xy-81y²)=5(x²+9xy+(81/4)y²-(81/4)y²-81y²)=

5((x+(9/2)y)²-(405/4)y²)=

5(x+(9/2)y-(√405/2)y)(x+(9/2)y+(√405/2)y)=

5(x+(9/2)(1-√5)y)(x+(9/2)(1+√5)y).

by Top Rated User (660k points)

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