7) x2 - 14x + 49
8) 2x - 14x
9) 10x2 - 14x3 + 18x4
10) 20a²b - 25a'b
11) 1 + a + ab + a²b
12) a² + bc + ab + bc
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Answer:
11.(1+a)+ab(1+a)
1+a)(1+ab)
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