Question

(x-1)^2-9=0 DAU CORONITA!!!!!!!!!!!!!!!!!

Answer 1

(x-1)^2=x^2-2x+1 din formula (a-b)^2=a^2-2ab+b^2
x^2-2x+1-9=0
x^2-2x-8=0
Delta=b^2-4ac=4+32=36
x1=-b+radical din delta/2a=(2+6)/2=4
x2=-b-radical din delta/2a=(2-6)/2=-2
S={4;-2}