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No. A factored form of one can not be used here.
27
Yes.
35x - 21 We note that '35' & '21' are both multiples of '7' ; (7 x 5 = 35 & 7 x 3 = 21). So seven is factored out. 7(5x - 3)
x2+10x+21 = (x+3)(x+7) when factored.....