how do u get that 12mn -4
2. Add:
(a) – 7mn + 5, 12mn + 2, 9mn – 8, – 2mn – 3
Answers
Answered by
0
Answer:
12mn - 4
Step-by-step explanation:
(– 7mn + 5) + (12mn + 2) + (9mn – 8) + (– 2mn – 3)
open the bracket and change the sign eventually
= – 7mn + 5 + 12mn + 2 + 9mn – 8 – 2mn – 3
Group it by like factors
= – 7mn – 2mn + 12mn + 9mn + 5 + 2 – 8 – 3
Add it
= -9mn + 21mn + 7 -11
= 12mn - 4
Similar questions