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NISA [10]
3 years ago
7

Find the sum of 12a + 7b, −6a − 9, and 14a − 12b.

Mathematics
2 answers:
Ivan3 years ago
8 0
The answer is:  [A]:  " 20a − 5b − 9 " .
______________________________________
Explanation:
_______________________________________________
  (12a <span>+ 7b) + (−6a − 9) + (14a − 12b) =
 
   12a </span><span>+ 7b  +  1(−6a − 9) + 1(14a − 12b) =
</span>    
   12a + 7b + (1*-6a) + (1*-9) + (1*14a) + (1* -12b) =
      
    12a + 7b − 6a − 9 + 14a − 12b =  ?

Combine the "like terms:

12a − 6a  + 14a = 20a ; 

7b − 12b =  - 5b ;

and then we have "-9" ;
_____________________________________________________
So, write as:   " 20a − 5b − 9 " ;  which is:  Answer choice:  [A].
______________________________________________________
Elden [556K]3 years ago
7 0

<u><em>Answer:</em></u>

<u><em>The answer is (A) </em></u>

<u><em>Step-by-step explanation:</em></u>

(12a + 7b) + (−6a - 9) + (14a − 12b)

Hence,

<u><em>20a - 5b - 9</em></u>

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