De oplossingen-
verzameling
van
(2x − 6)2 ≤ 0
is
A.   ]minoneindig, 3 ]
B.   ]minoneindig, − 3 ]
C.   [ 3, plusoneindig[
D.     ∅
E.   g.v.d.v.
A    B    C    D    E

[ 5-3720 - op net sinds 9.1.12-(E)-27.10.2023 ]

Translation in   E N G L I S H

The solution set of
  (2x − 6)2 ≤ 0   is
A.   ]minoneindig, 3 ] x ≤ 3
B.   ]minoneindig, − 3 ] x ≤ − 3
C.   [ 3, [ x ≥ 3
D.     ∅empty
E.   none of the above

Oplossing - Solution

  (2x − 6)2 ≤ 0
 ⇔  (2x − 6)2 = 0   [want (2x − 6)2 <: 0 is onmogelijk]
 ⇔  2x − 6 = 0   [want A²=0  ⇔  A=0 ]
 ⇔  2x = 6
 ⇔  x = 3
Het antwoord is dus 'geen van de vorige" !
gricha