1) 7a²-28=7(a²-4)=7(a-2)(a+2)
2) -2b²+18=-2(b²-9)=-2(b-3)(b+3)
3) 7x²y-7y²x=7xy(x-y)
4) 6x-6y=6(x-y)
5) 20-5x²=5(4-x²)=5(2-x)(2+x)
6) 13p²-13pc=13p(p-c)
7) 18x²+12x+2=2(9x²+6x+1)=2(3x+1)²
8) 9c-9=9(c-1)
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Answers & Comments
1) 7a²-28=7(a²-4)=7(a-2)(a+2)
2) -2b²+18=-2(b²-9)=-2(b-3)(b+3)
3) 7x²y-7y²x=7xy(x-y)
4) 6x-6y=6(x-y)
5) 20-5x²=5(4-x²)=5(2-x)(2+x)
6) 13p²-13pc=13p(p-c)
7) 18x²+12x+2=2(9x²+6x+1)=2(3x+1)²
8) 9c-9=9(c-1)