De
oplossingen-
verzameling
van
x + 3 <2(x + 3)
is 		A.   ]minoneindig, − 3[
B.   ] − 3, plusoneindig[
C.   ∅
D.   rplusnul
E.   r
Rmin = { x | x ≤ 0 }  Rminnul ={ x | x < 0 }   Rplus = { x | x ≥ 0 }  rplusnul = { x | x > 0 } 
A    B    C    D    E 

[ 3,4,5-4193 - op net sinds 13.10.10-(E)-27.7.2024 ]

Translation in   E N G L I S H

The solution set of

x + 3 <2(x + 3)   is 		A.   ( minoneindig, − 3)( x <− 3)
B.   ( − 3, ∞)(x >− 3 )
C.   ∅( empty )
D.   rplusnul( x >0 )
E.   R(all real x)

Oplossing - Solution

x + 3 < 2(x + 3) ⇔ x + 3 < 2x + 6 ⇔ x − 2x < 6 − 3 ⇔ −x < 3 ⇔ x > −3