Answer:
4x^2 - 16 = 0
<=> (2x)^2 - 4^2 = 0
<=> (2x + 4)(2x - 4) = 0
<=> x = -2 or x = 2
=> YES
x^2 - 4x + 4 = 0
<=> (x - 2)^2 = 0
<=> x = 2
4x^2 + 16x + 16 = 0
<=> 4(x^2 + 4x + 4) = 0
<=> 4(x + 2)^2 = 0
<=> x = -2
=> NO
Hope this helps!
:)
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