2-2х² = 2*(1-х²) = 2(1-х)(1+х)
4а²+8а+4 = 4(а²+2а+1) =4(а+1)²
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2-2х² = 2*(1-х²) = 2(1-х)(1+х)
4а²+8а+4 = 4(а²+2а+1) =4(а+1)²