Question

Calcule o valor das raízes.
Y = 2x² - 7x + 3

a) x1 = 1 e x2 = 1/5
b) x1 = 3 e x2 = 1/2
c) x1 = 2 e x2 = 1/3
d) x1 = 4 e x2 = 1/4

Answer 1

a= 2; b=-7; c=3

Δ=b²-4ac
Δ=(-7)²-4.2.3
Δ=49-24
Δ=25

$x= \frac{-b+-\sqrt{delta} }{2a}$
x=7±5/4

x' = 7+5/4
x' = 12/4
x' = 3

x''= 7-5/4
x'' = 2/2
x'' = $\frac{1}{2}$

Portanto, alternativa B.

Bons estudos!