Question

qual e a raize de 2x2+7x+3=0

Answer 1

2x² + 7x + 3 = 0 

Δ = 49 - 24

Δ = 25 

x = -7 +-√25/4
x = -7 +-5/4

x' = -7+5/4
x' = -2/4 
x' = -1/2

x'' = -7-5/4
x'' = -12/4
x'' = -3                                         S = { -3 , -1/2 }               ok

Answer 2

2x² + 7x + 3 = 0

Δ = b² -4ac
Δ = (7)² -4.(2).(3)
Δ = 49 - 24
Δ = 25

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

x' = -7 + 5/4
x' = -2/4
x' = -1/2

x" = -7-5/4
x" = -12/4
x" = -3