Each is a perfect square and the minus sign in-between allows it to be factored easily; (4x2+2y)(4x2-2y).
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(x - 4y)(x + y)
2x32
4 to the fourth power just means 4x4x4x4 and then the answer. So if you wanted to find the answer all you have to do is do 4x4 which is 16. Then 16x4 then find the answer. And then the answer to 16x4 times 4.
The answer is 4x4=16 16x4=64
Not sure which you mean, take your pick: (8y)3+27=(8y+3)((8y)2-3*(8y)+9)=(8y+3)(64y2-24y+9); or 8y3+27=(2y+3)(4y2-6y+9)