Question

afla pe x ...x la puterea 2 minos 1 =0

Answer 1

x²-1=0⇒x²=1⇒x=√1⇒x=+sau- 1

Answer 2

$x^{2} -1 = 0 \Rightarrow x^{2} =1 \Rightarrow x = \pm \sqrt{1} \Rightarrow x = \pm 1$