4z+xsquare=(x-2) (x+2) using identity a+b a-b
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Answer:
4z+x²=(x+2)(x-2)
a²+b²=(a+b)(a-b)
4z²+x²=(x-4)(x+4) (by placing square)
4z+x²=(x-√4)(x+√4)
4z+x²=(x-2)(x+2)