Question

rezolvati in multimea numerelor intregi ecuatia
x'2-x-6=0

Answer 1

x²-x-6=0
x²-3x+2x-6=0
x(x-3)+2(x-3)=0
(x-3)(x+2)=0
i)x-3=0⇒x₁=3∈Z
ii)x+2=0⇒x₂=-2∈ Z
S:x∈{-2,3}