Question

Решить уравнение x×x-1=8

Answer 1

${x}^{2} - 1 = 8 \ {x}^{2} = 1 + 8 = 9 \ x = 3$

Answer 2

Х×Х-1=8

2Х=8+1

2Х=9

Х=9:2

Х=4,5

Answer 3

2x=8-1

2x=7

X=7/2

X=3, 5