( a + b )² − c² = A.   (a + b − c) . (a + b + c)
B.   (a − b − c) . (a − b − c)
C.   (a + b + c)² . (a + b − c)
D.   (a + b − c)²
E.   (a − c) . (b − c)²
A    B    C    D    E

[ 3-8144 - op net sinds 29.1.2017-(E)-24.10.2023 ]

Translation in   E N G L I S H

( a + b ² − c² = A.   (a + b − c) . (a + b + c)
B.   (a − b − c) . (a − b − c)
C.   (a + b + c)² . (a + b − c)
D.   (a + b − c)²
E.   (a − c) . (b − c)²

Oplossing - Solution

  (a + b)² − c²
= [(a + b)+ c][(a + b) − c]
= (a + b + c)(a + b − c)
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