Question

resolva a equação:
x² - 3x - 4 = 0

Answer 1

Resposta:

a= 1; b= -3; c= -4

∆= b²-4ac

∆= -3²-4×1×(-4)

∆= 9+16

∆= 25

X= -b±√∆/2.a

X= -(-3)±√25/2.1

X= 3±5/2

X'= 3+5/2

x'= 8/2

x'= 4

x"= 3-5/2

x"= -2/2

x"= -1