3[(x^2) + 5] x (2x-y)
Do the parentheses first, then brackets next. P.e.m.d.a.s.
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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.
9 x 9
To write an exponent on a laptop you would use the "^" key. For example, "3^2" would be "three squared."
13a - l
If you want to show four squared, write the two as a superscript like this: 42