Question

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Answer 1

ALTERNATIVA A) S = {1;4}

Vamos aos valores:

A= 3

B= -15

C= 12

∆= b²-4.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}