Question

Calcula el resultado de estas operaciones. Extrae primero factor común.

a) (–8) · 7 + (–8) · 2 =
b) (–4) · 5 + (–8) · (–3) + (–4) · 6 =
c) (–2) · 7 + (–2) · (–3) =
d) (–5) · 7 + (–5) · (–12) =
e) 5 · 9 + 5 · (–11) =

Answer 1

a) (–8) · 7 + (–8) · 2
(-8)(7+2)
(-8)(9)
-72

b) (–4) · 5 + (–8) · (–3) + (–4) · 6
(-4)(5+6) +(-8)(-3)
(-4)(11) + (+24)
-44 + 24
-20

c) (–2) · 7 + (–2) · (–3)
(-2)(7-3)
(-2)(4)
-8

d) (–5) · 7 + (–5) · (–12)
(-5)(7-12)
(-5)(-5)
-25

e) 5 · 9 + 5 · (–11)
5(9-11)
5(-2)
-10