Question

Phân tích đa thức thành nhân tử:

16( x- y)² - 25(x+ y)²

Answer 1

\(=\left[4x-4y\right]^2-\left(5x+5y\right)^2\)

\(=\left(4x-4y+5x-5y\right)\left(4x-4y-5x+5y\right)\)

\(=\left(9x-9y\right)\left(y-x\right)\)

\(=-9\left(x-y\right)^2\)

Answer 2

16(x-y)²-25(x+y)²

=16(x-y)²-25(x-y)²

=(16-25)(x-y)²

=-9(x-y)²

Answer 3

=\(\left(-\left(y+9x\right)\right)\left(9x+y\right)\)