Jon P. answered 04/17/15
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When you have the log of a sum, there's not a lot you can do with it. However, in this case you can factor 4 from the two terms:
log4 (12x+8y)
= log4 (4 (3x+2y))
Now use the product rule...
= log4 4 + log4 (3x+2y)
Remember that the log of the base is always 1 (because the base raised to the first power is the base itself). So that equals:
1 + log4 (3x+2y)
That gives you the three things that go in the blanks