(x-1)²-(x-2)(x+2)=9

(x-1)²-(x-2)(x+2)=9 x^2 - 2x +1 - x^2 +4 =9 -2x = 4 x =-2

(x-1)²-(x-2)(x+2)=9 x²-2x+1-x²+4=9 -2x=9-1-4 -2x=/4(-2) x=-2 sory za pomylke

(x-1)²-(x-2)(x+2)=9 musimy skorzystac z dwoch wzorow skroconego mnozenia a mianowicie x²-2x+1-(x²-4)=9 x²-2x+1-x²+4-9=0 -2x-4=0 -2x=4 |:(-2) x= -2