Question

Tìm các số nguyên x ; y biết: \(2x\left(2y-14\right)-8\left(y-7\right)=0\)

Answer 1

2x(2y-14)-8(y-7)=0

=>\(4x\left(y-7\right)-8\left(y-7\right)=0\)

=>\(\left(y-7\right)\left(4x-8\right)=0\)

=>\(\left\{{}\begin{matrix}y-7=0\\4x-8=0\end{matrix}\right.\)

=>\(\left\{{}\begin{matrix}y=7\\x=2\end{matrix}\right.\)

Answer 2

 4x (y - 7) - 8(y-7) =0

(4x-8) (y-7)=0
x=2 y =7