Question

Rezolvati ecuatia:(x^2-4)(9-x^2)=0

Answer 1

(x²-4)(9-x²)=0
x²-4=0  ⇒x₁,₂=√4  x₁=2   x₂=-2
9-x²=0  ⇒x₁,₂=√9  x₁=3   x₂=-3

Answer 2

(x²-4)(9-x²)=0
x²-4=0  ⇒x=√4 ⇒x=|2| ⇒ x=2  sau x=-2
9-x²=0  ⇒x=√9  ⇒x=|3| ⇒ x=3  sau x=-3