Answered

Magtanong at makakuha ng mga sagot ng eksperto sa IDNStudy.com. Ang aming komunidad ay nagbibigay ng eksaktong sagot upang matulungan kang maunawaan at malutas ang anumang problema.

this is adding ad subtracting rational expression (dissimilar)
2 over a+3 - (minus) 4 over a-3

please i really need it right now

Sagot :

KookEinidn
     2                 4     
  a + 3           a - 3

Factor the denominators. (The given denominators are already on their factored form so we'll just copy them).
a + 3 = a + 3
a - 3 = a - 3

Let's construct their LCD.
LCD = (a + 3)(a - 3)

Rewrite each rational expression with the LCD as denominator.
     2                 4        =       2 (a - 3)               4 (a + 3)    
  a + 3           a - 3          (a + 3)(a - 3)         (a + 3)(a - 3) 

We get 2(a - 3) and 4(a + 3) from dividing the LCD to their factored denominators then multiply them to their numerator.
(a + 3)(a - 3)   =   a - 3
     a + 3

(a + 3)(a - 3)   =   a + 3
     a - 3

Now do the indicated operation.
    2 (a - 3)   -     4 (a + 3)      =      2 - 4              
          (a + 3)(a - 3)                          1
                                              =      -2    
                                                       1
                                              =    -2

That's it. Hope you understand it! :)
                                                                                  -KookEin
Note: It's not copied :)