Question

x​ mũ 2 -1 =17 . tìm x

Answer 1

\(x^2+1=17\) chứ.

Answer 2

x²+1=17

x² =16

x² =4²

\(\Rightarrow\)x=4

Answer 3

\(x^2-1=17\)

\(\Rightarrow x^2=18\)

\(\Rightarrow x\in\left\{\varnothing\right\}\)

Vậy \(x\in\left\{\varnothing\right\}\)

Answer 4

\(x^2-1=17\)
\(x^2=17+1\)
\(x^2=18\)
\(x=\sqrt{18}\)

 

Answer 5

\(x^2-1=17\)

\(x^2=17+1\)

\(x^2=18\)

\(x=\sqrt{18}\)

Answer 6

x²- 1 = 17

→x² - 1² = 17

→x - 1 = 17

x = 17 + 1

x = 18

Answer 7

Sai đề.
Sửa:
\(x^2+1=17\)
\(x^2=17-1\)
\(x^2=16\)
Ta thấy: 16 = 4²
\(\rightarrow x^2=4^2\)
^{\(\rightarrow x=4\)}