Jeff W. answered • 10/06/15
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Hi Jacob, I don't think I completely understand your question, but it looks like the expression you're giving is related to the Distributive Property.
We know that (12+3)x is just plain old 15x (since we can add the 12 and the 3 in the parentheses).
But by the distributive property, we could also say that (12+3)x = 12x + 3x . And 12x +3x also equals 15x.
Hope that helps. If you have some additional info for me or need some more help, just message me!
Jeff
