(а-1)(1+а)(а²+1) = (a²-1)(a²+1) = a⁴-1
(3-p)(p²+9)(p+3) = (3-p)(3+p) (p²+9) = (9-p²)(9+p²) = 81-p⁴ = -p⁴+81
(p+q)²(p+q)² = (p+q)⁴ = p⁴+4p³q+6p²q²+4pq³+q⁴
(5+m)(m-5)(m-5)(m+5) = ((m+5)(m-5))((m-5)(m+5)) = (m²-25)(m²-25) =
= (m²-25)² = m⁴-50m²+625
(а-1)(1+а)(а²+1) = (a²-1)(a²+1) = a⁴-1
(3-p)(p²+9)(p+3) = (3-p)(3+p) (p²+9) = (9-p²)(9+p²) = 81-p⁴ = -p⁴+81
(p+q)²(p+q)² = (p+q)⁴ = p⁴+4p³q+6p²q²+4pq³+q⁴
(5+m)(m-5)(m-5)(m+5) = ((m+5)(m-5))((m-5)(m+5)) = (m²-25)(m²-25) =
= (m²-25)² = m⁴-50m²+625