1. 16х²-4 = 4 (4х²-1) = 4 (2х-1)*(2х+1)
2.(5х-3y)²-16x²= 25x²-30xy+9y²-16x²=9x²-30xy+9y²
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1. 16х²-4 = 4 (4х²-1) = 4 (2х-1)*(2х+1)
2.(5х-3y)²-16x²= 25x²-30xy+9y²-16x²=9x²-30xy+9y²