Resolução
5x² + 3x - 2 = 0
a = 5
b = 3
c = -2
Δ = b² - 4 .a .c
Δ = 3² - 4 .5 .(-2)
Δ = 9 + 40
Δ = 49
x = -b ± [tex]\sqrt{Delta}[/tex] /2 .a
x = -3 ± [tex]\sqrt{49}[/tex] /2 .5
x = -3 ± 7 /10
x' = -3 + 7 /10
x' = 4 /10 (simplifica por 2)
x' = 2 /5
x" = -3 -7 /10
x" = -10 /10
x" = -1
x = ( -1, [tex]\frac{2}{5}[/tex] )
Resposta c)
