Simplify x^2-7x+12/x^2-16?

Question

How is this problem done? Please explain, only serious answerers. Thanks

Answer 1

(x-3)(x-4) / (x-4)(x+4)

2 x-4 cancel

x-3/x+4

Answer 2

factor top and bottom

(x-3)(x-4) <=== as the numbers add to -7 and multiply to +12

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

(x+4)(x-4)<==== as this is the difference of 2 squares

(x-3)

------

(x+4)

and thats it!

Answer 3

x^2-7x+12 =  x^2-4x-3x+12  ==> (x-3)(x-4)

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

x^2-16 = (x+4)(x-4)

           (x-3)

====> ------

           (x+4)

This is the answer and give me 10 points please.