Question

x²-25=0

Answer 1

`x^2-25=0`

`<=>(x-5)(x+5)=0`

`<=>[(x-5=0),(x+5=0):}`

`<=>[(x=5),(x=-5):}`

Answer 2

\(\left(x-5\right)\left(x+5\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=5\\x=-5\end{matrix}\right.\)

Answer 3

<=>(x-5)(x+5)=0

<=>\(\left[{}\begin{matrix}x-5=0\\x+5=0\end{matrix}\right.< =>\left[{}\begin{matrix}x=5\\x=-5\end{matrix}\right.\)

=> ptrinh có tập Nghiệm: S={\(\pm5\)

Answer 4

a) ${}^{}-25=0$

${}^{}=0+25=25$

${}^{}={}^{}={}^{}$

$\Rightarrow [\begin{array}{c}x=5\\ x=-5\end{array}$

Answer 5

Trả lời: