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Sagot :

Bonsoir,

z= 4

(4z + 7)²- (4z-7)²

(4*4 +7)²  - (4*4 -7)²

= 15² - 9²

= 225- 81

= 144

b. -2 z+2

=  -2*4 +2

= -8 +2

= -6

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