(xy − 1)2

is gelijk aan 		A.   1 − 2xy + x2y2
B.   x2y2 + 1
C.   xy2 − 2xy + 1
D.   x2y2 + 2xy + 1
E.   x2y2 − 1
                 

[ 2,3-1512 - op net sinds 9.3.13-(E)-24.10.2023 ]

Translation in   E N G L I S H

(xy − 1)2
is equal to 		A.   1 − 2xy + x2y2
B.   x2y2 + 1
C.   xy2 − 2xy + 1
D.   x2y2 + 2xy + 1
E.   x2y2 − 1

Oplossing - Solution

(xy − 1)² = (xy)² − 2.xy.1 + 1² = x²y² − 2xy + 1