Verified Answer :

belcatya

use formula^:   a²-b²= (a-b)(a+b)
x²-1=0
x²-1²=0
(x-1)(x+1)=0
x-1=0⇒ x₁=-1
x+1=0 ⇒x₂=1
Answer: x=+-1

Panoyin

x² - 1 = 0
   + 1  + 1
      x² = 1
       x = +1

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