It is 2/3 in its simplest form
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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.
3² + 20 ÷ 2² = 9 + (20 ÷ 4) = 14.
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