Question

48 ) a) X+5+4/x=0
B) 10x/3+3/x=7

Answer 1

48)

a) x +5+4/x=0

temos

x + 5 + 4/x = 0

x^2 + 5x + 4 = 0

os coeficientes

a = 1

b = 5

c = 4

delta

d = 25 - 16 = 9

as raízes

x1 = (-5 + 3)/2 = -1

x2 = (-5 - 3)/2 = -4  

b) 10x/3 + 3/x = 7

10x + 9/x = 21

10x^2 + 9 - 21x = 0

os coeficientes

a = 10

b = -21

c = 9

delta

d = 441 - 360 = 81

as raízes

x1 = (21 + 9)/20 = 3/2

x2 = (21 - 9)/20 = 3/5