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(4x+9x)²

Answer» (4x+9x)²We use (a+b)²=a²+b²+2ab=4x²+9x²+2*4x*9x=16x²+81x²+72=97x²+72x²=169x²
169x2
(4x+9x)²= (13x)2= 169x2


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