Question

h ) x^2 - 49

Giúp mik vs cần gấp 

Answer 1

\(x^2-49=0\)

\(\Leftrightarrow x^2=49\)

\(\Leftrightarrow x^2=\left(\pm7\right)^2\)

\(\Leftrightarrow\left[{}\begin{matrix}x=7\\x=-7\end{matrix}\right.\)

Answer 2

Đề bài là gì bạn cần nói rõ.

Answer 3

\(x^2-49=x^2-7^2=\left(x-7\right)\left(x+7\right)\)

Answer 4

\(x^2-49=x^2-7^2=\left(x+7\right)\left(x-7\right)\)

 

Answer 5

\(x^2-49=\left(x-7\right)\left(x+7\right)\)