Question

AX²+A²Y-7X-7Y

Answer 1

Sửa đề: A²X + A²Y - 7(X - Y)

= A²(X + Y) - 7(X + Y)

= (X + Y)(A² - 7)

Answer 2

\(ax^{2\:}+a^2y-7x-7y\\ =a^2\left(x+y\right)-7\left(x+y\right)\\=\left(a^2-7\right)\left(x+y\right) \)