Question

 (x-5) (x-7)=0
help me mk cần gấp chiều nay

Answer 1

  \(\left(x-5\right)\left(x-7\right)=0\)

=>\(\left\{{}\begin{matrix}x-5=0\\x-7=0\end{matrix}\right.\)

=>\(\left\{{}\begin{matrix}x=5\\x=7\end{matrix}\right.\)

Vậy S ={5,7}

Answer 2

x - 5 = 0

x = 0 + 5

x = 5

⇔ x ∈ {5;7}

Answer 3

x - 5 = 0

x = 0 + 5

x = 5

⇔ x ∈ {5;7}