Question

Zapisz w jak najprostszej postaci:

a) (4 – 2x) + (7x – 2) =

b) 2a + (3a – 2b) – (2a – 3b) =

c) – c – (– 3c2 – 3c) + 5 =

d) 5(a2 – 3a) – 2a(– 8 – a) =

e) 3x−9y+123 =

f) – 5(4p – 2) – 30p−55 =

g) (3a + 8)(2 + b) =

h) (2x – 3)(1 – 4x) =

Answer 1

Zadaniea) (4 - 2x) + (7x - 2) = 4 - 2x + 7x - 2 = 5x + 2   b) 2a + (3a - 2b) - (2a - 3b) = 2a + 3a - 2b - 2a + 3b = 3a + b c) -c - (- 3c² - 3c) + 5 = -c + 3c² + 3c + 5 = 3c² + 2c + 5 d) 5(a² - 3a) - 2a(- 8 - a) = 5a² - 15a + 16a + 2a² = 7a² + a   e) 3x - 9y + 123 = f) -5(4p - 2) - 30p - 55 = -20p + 10 - 30p - 55 = -50p - 45 g) (3a + 8)·(2 + b) = 6a + 3ab + 16 + 8b h) (2x - 3)·(1 - 4x) = 2x - 8x² - 3 + 12x = -8x² + 14x - 3