Răspuns:
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a )
2x - 1 = 5
2x = 5 + 1
2x = 6
x = 6 : 2
x = 3
S = { 3 }
b )
( x - 2 )( x + 3 ) = 0
x - 2 = 0
x = 0 + 2
x = 2 ( I )
x + 3 = 0
x = 0 - 3
x = - 3 ( II )
S { 2 ; -3 }
c )
( 2 - x )( x + 3 ) = 0
2 - x = 0
- x = 0 - 2
- x = - 2
x = 2 ( I )
x + 3 = 0
x = 0 - 3
x = - 3 ( II )
S = { 2 ; - 3 }