Question

EQUAÇOES DO 2º GRAU x2-3x-4=0 discriminante

Answer 1

a=1 b=-3 c=-4
∆= b2 - 4.a.c
∆= (-3)2 - 4.1.-4
∆= 9 + 16 = 25

x= -b +/- √∆/ 2.a
x= 3 +/- 5/2
x'= 3+5/2= 4
x''= 3-5/2= -2

S={ 4,-2}