Question

Achar as raízes das equações:

x²-3x-4=0

Answer 1

x² - 3x - 4 = 0
a = 1
b = -3
c = -4

Δ= b² -4ac
Δ = (-3)² - 4 . 1 . (-4)
Δ = 9 + 16
Δ = 25

x = -b+-√Δ/ 2a
x = - (-3) +- √25 / 2.1
x = 3 +- 5/ 2
x1 = 3+5/2 = 8/2 = 4
x2 = 3-5/2 = -2/2 = -1

V = { 4,-1}

Answer 2

x²-3x-4=0
a=1
b=-3
c=-4
∆= b²-4ac
(-3)² -4.1.(-4)
+9+16
∆=25

Vamos para a fórmula de Bhaskara..

x=-b+/-√∆/2a
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