Question

equação do 2° grau x2-3x-4=0

Answer 1

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

x = [ - b +/- √∆]/2a
x = [ -(-3) +/- √25]/2.1
x = [3 +/- 5]/2
x' = [3 + 5]/ 2 = 8/2 = 4
x" = [3 - 5]/2 = -2/2 = - 1

R.: ( 4; - 1)