Factories:(1)X²+9x+18 ( 2) 6x²+7x-3(3)2x²-7x-15. (4)84-2r-2r²

1.	Factories:(1)X²+9x+18 ( 2) 6x²+7x-3(3)2x²-7x-15. (4)84-2r-2r²
Answer» (3)2x2-10x+3x-15=2x(x-10)+3 (x-10)=(x-10) (2x+3) (2)6x2+9x-2x-3=3x(2x+3) -1(2x+3)=( 2x +3) (3x-1) X2+3x+6x+18=X (x+3) 6 (x+3)=(x+3) (x+6)

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