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aider moi svp
a) 3x – 5 = 6 – 2x
b) (4x – 3)(7x + 5) = 0
c) x² - 36 = 0

Sagot :

MAUDMARINE

Bonjour,

a) 3x – 5 = 6 – 2x

3x + 2x = 6 + 5

5x = 11

x = 11/5

b) (4x – 3)(7x + 5) = 0

4x - 3 = 0          ou         7x + 5 = 0

4x = 3                            7x = - 5

x = 3/4                            x = - 5/7

c) x² - 36 = 0

(x - 6) (x + 6) = 0

x - 6 = 0            ou           x + 6 = 0

x = 6                                 x = - 6.