x²+8xy+15y²+x-y-6
=x²+(8y+1)x+15y²-y-6
=x²+(8y+1)x+(3y-2)(5y+3)
=x²+{(3y-2)+(5y+3)}x+(3y-2)(5y+2)
={x+(3y-2)}{x+(5y+3)
=(x+3y-2)(x+5y+3)
x²+8xy+15y²+x-y-6
=x²+(8y+1)x+15y²-y-6
=x²+(8y+1)x+(3y-2)(5y+3)
=x²+{(3y-2)+(5y+3)}x+(3y-2)(5y+2)
={x+(3y-2)}{x+(5y+3)
=(x+3y-2)(x+5y+3)
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