Question

equação de segundo grau 5x2+9x-2=0

Answer 1

5xX2+9x-2=0
calcula
10x+9x-2=0
coloque o termo e some
19x-2=0
muda a posição e inverte o sinal
19x=2
x= 2
19

Answer 2

5x² + 9x - 2 = 0


delta = b² - 4.a.c

a = 5
b = 9
c = 2


delta = 9² - 4.5.(-2)
delta = 81 + 40
delta = 121

x = -b ± √delta/2.a

x = -9 ± √121/2.5

x = -9 ± 11/10

x = -9 - 11/10 = -20/10 = -2

x = -9 + 11/10 = 2/10 = 1/5


s={ -2, 1/5 }