Take your pick: a, 2a, 3a, 4a .... etc
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2a + 3a = 5a
It is: 5a2
Well, honey, 5a squared is just 5 times a squared. It's as simple as that. So if you're looking for the value of 5a squared, just make sure you don't forget to square that 'a' and multiply it by 5. Easy peasy lemon squeezy!
2a - 5a = -3a
5a