(a - 1)(2a - 3)
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Factor 5a-15 Factor out the 5; 5(a-3)
5a
It is: 5(a+b)
5a2-15 = 5 (a2-3) = 5 (a-sqrt(3))(a+sqrt(3)) as a2-b2=(a-b)(a+b)
The GCF of 35 a^2 and 85ab is 5a. The GCF of 35 and 85 is 5, and the GCF of a squared and ab is a.