I guess you mean: 2a^2+6a
Well in this case you take 2a out of the bracket and then you're left with a+3 inside.
2a(a+3a)
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6a squared-8ab+2a factor completely and check mentally
Divide by 6a: 6a(a + 3b)
Since the question is 3(2a), then just write it out. 3(2a) is 2a+2a+2a or 6a.
2a*3 = 8+4a 6a = 8+4a 6a-4a = 8 2a = 8 a = 4
= 2a - 10