Вправи: 766

766. Подайте у вигляді многочлена:

1) (–а² + 7)(7 + а²) = (7 – а²)(7 + а²) = 49 – а⁴;

2) (–p² – q⁷) (p² + q⁷) = –(p² + q⁷)(p² + q⁷) = –(p² + q⁷)² = –(p⁴ +

2p²q⁷ + q¹⁴) = –p⁴ – 2p²q⁷ – q¹⁴;

3) (–8m – 5p)(–8m + 5p) = –(5p + 8m)(5p – 8m) = –(25p² – 64m²) =

64m² – 25p²;

4) (–2а³ – 3b)(–3b + 2а³) = –(2а³ + 3b)(2а³ – 3b) = –(4а⁶ – 9b²) =

–4а⁶ + 9b².