5a x a = 5a2
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what is 5a x 3 x 2b
5a^(3) if the x means multiplication. 5a^(3)x^(3) if the x is a variable.
Oh, dude, 5a x 5a is just 25a^2. It's like multiplying 5 by 5 to get 25, and then you just stick that 'a' in there twice because math said so. So yeah, 25a^2, easy peasy lemon squeezy.
5a + 4b - 3a =(5a - 3a) + 4b =2a + 4b =2 (a + 2b)
25a