Factorize x²-y²-6y-9 – InterviewSolution

1.

Factorize x²-y²-6y-9

Answer»

x²-y²-6Y-9

x²- (y² + 6y + 9)

(X)² - (y + 3)² [x²+2xy+y² = (x+y)²]

[x-(y+3)] [x+(y+3)] [ x²-y² = (x+y)(x-y) ]

(x-y-3) (x+y+3)

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