As an algebraic expression it is 10x
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4x * x = 4x^2
16x2-9
She isn't. 4x squared is 4 times (x squared). That is, 4 times (3 squared) = 4 times 9. If you want it to be the square of 4x (which would be the square of 4 times 3, ie, 12), you have to write it as (4x)squared.
4x-5.
if you mean: 3x3 times 4x3 = 12x6if you mean: (3x)3 times (4x)3 = 27x3 times 64x3 = 1728x6 oh and also my penis is 3x