4 squared is 4 x 4 which equals 16.
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If you mean: 4x squared+7x+4 then the discriminant is -15
5
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.
Four to the second power is 16 or four squared.
Seems to us that any value at all can be squared.