Вправи: 634

634. Розкладіть на множники:

1) a² – b² – (a – b) = (a² – b²) – (a – b) = (a – b)(a + b) – (a – b) = (a – b)(a + b – 1);

2) p² – b – p – b² = (p² – b²) – (b + p) = (p – b)(b +p) – (b + p) = (b +

+ p)(p – b – 1);

3) 16x² – 25y² + 4x – 5y = (16x² – 25y²) + (4x – 5y) = (4x – 5y)(4x +

+ 5y) + (4x – 5y) = (4x – 5y)(4x + 5y + 1);

4) 100m² – 10m + 9n – 81n² = (100m² – 81n²) – (10m – 9n) = (10m –

– 9n)(10m + 9n) – (10m – 9m) = (10m – 9n)(10m + 9n – 1).