sophiii
contestada

Write this expression in standard form by collecting like terms:

9 (a - b) + 5 (2a - 2b)

A. 14a - 14b

B. 8a - 7b

C. 19a - 19b

D. -19a + 14b

please help asap, thank you!

Respuesta :

9 (a - b) + 5 (2a - 2b)

mutiply the first bracket by 9

(9)(a)= 9a

(9)(-b)= -9b

mutiply the second bracket by 5

(5)(2a)=10a

(5)(-2b)= -10b

9a-9b+10a-10b

9a+10a-9b-10b ( combine like terms)

Answer : C. 19a - 19b