x x+1 _____ = ______ x-1 x+3
x x+1
_____ = ______
x-1 x+3
x:(x-1)=(x+1):(x+3) x(x+3)=(x-1)(x+1) x²+3x=x²-1 3x=-1 x=-1:3 x=-⅓
x ---------x+1 _____ = ______ x-1 -------x+3 x ≠1 i x≠-3 (x-1)(x+1)=x(x+3) x²-1=x²+3x 3x=-1 x=-1/3
x:(x-1)=(x+1):(x+3) x(x+3)=(x-1)(x+1) x²+3x=x²-1 3x=-1 x=-1:3 x=-1/3