Question

Solve: x+4/4 = x/x-2 answers are {-4,2}

Answer 1

Answer:

x=4                         x=-2

Step-by-step explanation:

x+4                  x

----------- = ------------

4                  x-2

Using cross products

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

FOIL

x^2 -2x +4x -8 = 4x

Combine like terms

x^2 +2x -8 = 4x

Subtract 4x from each side

x^2 +2x-4x -8 = 4x-4x

x^2 -2x-8 =0

Factor

What 2 numbers multiply to -8 and add to -2

-4*2 =-8

-4+2 = -2

(x-4) (x+2) =0

Using the zero product property

x-4+4 =0+4         x+2-2=0-2

x=4                         x=-2