Question

помогите пажалуйста. !

Answer 1

$x ^{2} - 1 = x ^{2} - 2x + 6 \\ 2x = 7 \\ x = \frac{7}{2} \\ x = 3.5$

Answer 2

$(x-1)*(x+1)=x^{2}-2*(x-3)$
$x^{2}-1=x^{2}-2x+6$
$x^{2}-x^{2}+2x=6+1$
$2x=7$
$x=7:2$
$x=3,5$