Question

a) 3(4x + 2) = ?
b) (3x – 20 ) (2 + 5x) =?
c) 2d (6 + 2d) – (4d +5)=?
Ma puteti ajuta va rooog , am nevoie azi de ele

Answer 1

a) 3·(4x + 2) =

= 3·4x + 3·2

= 12x + 6

b) (3x – 20 )·(2 + 5x) =

= 3x·2 - 20·4 + 3x·5x - 20·5x

= 6x - 80 + 15x² - 100x

= 15x² - 94x - 80

c) 2d·(6 + 2d) – (4d +5) =

= 2d·6 + 2d·2d - 4d - 5

= 4d² + 12d - 4d - 5

= 4d² + 8d - 5