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Mazyrski [523]
3 years ago
14

Factor completely 2x2 − 2x − 40.

Mathematics
2 answers:
Tomtit [17]3 years ago
7 0

Answer:

option <u>A</u> is true

Step-by-step explanation:

i took the test! :D

Ber [7]3 years ago
3 0
The answer is:  [A]:  " 2(x − 5)(x + 4) " .
_____________________________________________________
Given:  " 2x² <span>− 2x − 40 " ; 

We can factor out a "2" ; 

2(x</span>² − x <span>− 20)

Now, we can write down the "2" ; and factor the:  "</span>(x² − x − 20)" ;

2 * 
   (x² − x − 20) ;
_______________________________________________________
Take a look at:  "(x² − x − 20)"  ;  we have "-1x" and "-20" ; 

                                                                so, -5 and +4  ; 
                                                                or;  +5 and -4 ; to get "-20" ;
                                                               _______________________
                                                                  (we choose the "5" and "4" factors of 
                                                                      "-20" because we also have "-1" ; 
                                                                                  and "5 -4 =1" ;
                                                                      Now, (-5 + 4 = -1) ; 
                                                                         and: (+5 - 4 = +1).
                                                                      So; we'll stick with (-5 + 4) ; 

                                              (x² − x − 20) = (x − 5)(x + 4) ;
________________________________________________
Then, bring down the "2" ; and we have our answer:
__________________________________________________
      " 2x² − 2x − 40 "  

        =  " <span>2(x − 5)(x + 4) " ;  which is:  Answer choice:  [A] .
_______________________________________________</span>
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