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Exercice 4: équations et équivalences /2
Si x = 7, peut-on dire que:
a)2(x + 3) = 20 b)(x - 2) × 3 = 18 c) 3x-1/3 = 10 d)(x + 1)(x - 1) = 48 ?

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si  x = 7

2 ( x + 3 ) = 20

2 ( 7 + 3) = 20

20 = 20

( x - 2 ) x 3 = 18

( 7 - 2) x 3 = 18

15 ≠ 18

3 x - 1/3 = 10

21 - 1 /3 = 10

63/3 - 1 /3 = 30 /3

62/3 ≠ 30/3

( x + 1 ) ( x - 1 ) = 48

( 7 + 1 ) ( 7 - 1 ) = 48

8 x 6 = 48

48 = 48