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Verified Answer :

MissPhiladelphia

For finding GCF, just find the least number among them.
For example: 
a.) 6x^2 - 9 find what number that can be divided to 6. In this case, it is 2 and 3. 
You can't divide 9 by 2 so the answer in this equation would be 3.

b.) 2a^ 2 + 22a + 60 I's just the same method to use. In this case, we will use 2a^2. The factors that can be divided to 2 is (2,1). So we will choose 2 because it is the GCF of 2 and the equation is divisible by 2.

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