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A2+4.8ab-x2-4.8xb=(a-x)(a+x)+4.8ab-4.8xb= (a-x)(a+x)+4.8b(a-x)=(a-x)(a+x+4.8b)
a² + 4,8ab - x² - 4,8xb = (a² - x²) + (4,8ab - 4,8xb) =
= (a - x)(a + x) + 4,8b(a - x) = (a - x)(a + x + 4,8b)