Help 11 ​

factor the numerators and denominators to get

(x+5)(x+4)    (x-4)(x+3)

-------------------------------

(x+3)          (x-1)(x+4)    

Denominator cannot = 0   so x cannot equal  -3 +1 -4      

cancel out like terms in Num and denom and you are left with:

(x+5)(x-4)

--------------

(x-1)

12)

  3x          x + 7

____   -   _____

x - 7          x

3x ( x)             (x + 7) ( x - 7)

______     -    ___________

(x - 7) x             (x - 7) x

3x ( x) -  (x - 7) ( x + 7)

__________________

    (x - 7)  x

3x^2  -  [ x^2 - 49)

_______________

  (x - 7)  x

2x^2 + 49

________

x ( x - 7)