show that .(5x+6)²-120 x=(5 x-6)²
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( 5x + 6)² – 120x = ( 5x–6)²
25x² + 36 + 60x – 120 = 25x² + 36 –60x
60x + 60x = 120x
120x = 120x
therefore, L.H.S = R.H.S
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