How do i do this i don't know how to do it

X^2 - 4 =           (x-2) (x + 2)

x^2 -4x + 4=     (x - 2) (x -2)

2 numbers that multiply to 4
those 2 numbers have to add up to -4

-2 x -2 = 4
-2 + -2 = -4

now to divide      (x -2 )(x +2 ) 
                           ( x-2 ) (x - 2)

x -2 cancels 

the answer is x+2 divide by x-2

32

step-by-step explanation:

these are your clues: 1. kim ran 18 races2. this was four fewer races than twice thenumber, notice it says twice the number, so you would do the equation 18x2-4; which equals the number 32.thus, 32 is your answer.