Question

Me ajudem 
e) 5x² - 3x - 2 = 0

Answer 1

5x² - 3x - 2 = 0

Temos que:
a=5
b= -3
c= -2

Δ=b² - 4ac
Δ= (-3)² - 4 .5.(-2)
Δ= 9 + 40
Δ=49

x= -b +/- √Δ / 2a
x= -(-3) +/- √49 / 2.5
x'= 3 + 7 / 10
x'= 10/10
x'=1

x''= 3 -7 /10
x''= -4/10
x''=0,4