solve this plzz help me
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I'm not understanding pls post it again pls
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9x²+12xz+4z²-4y²
= {(3x)²+2*3x*2z+(2z)²}-4y²
= (3x+2z)²-(2y)² ( use identity (a+b)²=a²+2ab+b²)
= ( 3x+2z+2y)(3x+2z-2y) ( use identity a²-b²= (a+b)(a-b) )
Ans:(3x+2z+2y)(3x+2z-2y)
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