Question

$2(x + 1)(x - 1) = {x}^{2} - 1$
A) Compatible
B) Incompatible
C) Racional
D) Irracional
E) a y c ​

Answer 1

$2(x+1)(x-1)=x^{2}-1$

$2(x^{2}-1)=x^{2}-1$

$2x^{2}-2=x^{2}-1$

$2x^{2} -x^{2}=-1+2$

$x^{2} =1$

$x$ = ± $1$