Question

5x ao quadrado 3x-2=0

Answer 1

5x² - 3x - 2 = 0


delta = b² - 4.a.c

a= 5
b= -3
c= -2


delta = (-3)² - 4.5.(-2)
delta = 9 + 40
delta = 49

x = -b ± √delta/2.a

x = -(-3) ± √49/2.5

x = 3 ± 7/10

x = 3 + 7/10 = 10/10 = 1

x = 3 - 7/10 = -4/10 = -2/5

s={ 1, -2/5}