bonjour
x² + x - 5 = 3 x + 10
- 3 est t - il solution ?
( - 3 )² + ( - 3) - 5 = 3 ( - 3) + 10
9 - 3 - 5 = - 9 + 10
1 = 1
donc - 3 est solution
5 x - 6 = 2 x + 3
5 x - 2 x = 3 + 6
3 x = 9
x = 3
( 5 x - 6 ) ( 2 x + 3 ) = 0
soit 5 x - 6 = 0 et x = 6/5
soit 2 x + 3 = 0 et x = - 3/2
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bonjour
x² + x - 5 = 3 x + 10
- 3 est t - il solution ?
( - 3 )² + ( - 3) - 5 = 3 ( - 3) + 10
9 - 3 - 5 = - 9 + 10
1 = 1
donc - 3 est solution
5 x - 6 = 2 x + 3
5 x - 2 x = 3 + 6
3 x = 9
x = 3
( 5 x - 6 ) ( 2 x + 3 ) = 0
soit 5 x - 6 = 0 et x = 6/5
soit 2 x + 3 = 0 et x = - 3/2