Om (a − b)2 te verkrijgen,
moet men de volgende term
van (a + b)2 aftrekken :
A.   2b
B.   2ab
C.   2b2
D.   4b2
E.   4ab
                 

[ 0809 - op net sinds 30.6.10-(E)-29.10.2023 ]

Translation in   E N G L I S H

To obtain   (a − b)2,
you have to substract
the following term
from   (a+b)2 : 		A.   2b
B.   2ab
C.   2b2
D.   4b2
E.   4ab

Oplossing - Solution

(a − b)² = a² − 2ab + b²
(a + b)² = a² + 2ab + b²
−2ab = +2ab − 4ab