1) 6c²-24= 6(c²-4)=6(c²-2²)=6(c-2)(c+2)
2) x²+2xy+y²+4x+4y =(x²+2xy+y²)+(4x+4y)=(x+y)²+4(x+y)=(x+y)(x+y)+4(x+y)=
=(x+y)(x+y+4)
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Answers & Comments
1) 6c²-24= 6(c²-4)=6(c²-2²)=6(c-2)(c+2)
2) x²+2xy+y²+4x+4y =(x²+2xy+y²)+(4x+4y)=(x+y)²+4(x+y)=(x+y)(x+y)+4(x+y)=
=(x+y)(x+y+4)