Welke term moet
men bij   (a − b)2
bijtellen om
(a + b)2
te verkrijgen ? 		A.   2b
B.   2ab
C.   2b2
D.   4b2
E.   4ab
                 

[ 0822 - op net sinds 30.6.10-(E)-29.10.2023 ]

Translation in   E N G L I S H

Which term
should be add
to   (a - b)2
in order to
obtain (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 + 4ab = 2ab