Answered

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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 :)