Question

rezolvati ecuatia (x² - 4) (9 - x²) =0
unde x∈ Z

Ajutor va rog!

Answer 1

In primul caz: $x^{2} -4=0 => x^{2} =4$=>x={-2,2}
al doilea caz: $9- x^{2} =0 => x^{2} =9$=>x={-3,3}
=> S={-3,-2,2,3}