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Sagot :

ALTERNATIVA A) S = {1;4}

Vamos aos valores:

A= 3

B= -15

C= 12

= -4.a.c

= (-15)² -4.3.12

= 225 - 144

= 81

x = -B+- / 2.a

x= -(-15)+- 81/ 2.3

x= 15+- 9 / 6

x' = 24/6= 4

x" = 6/6 = 1

S= {1,4}