Question

quais as raízes da equacao 2x2+5x-3=0

Answer 1

2 x² + 5 x - 3 = 0

a = 2
b = 5
c = -3

Δ = b² - 4* a *c
Δ = 5² - 4 * 2 * ( - 3 )
Δ = 25 + 24
Δ = 49

x = - b +- √Δ / 2*a

x = - 5 + - 7 / 4

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

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

S = { 1/2 ; - 3 }

Answer 2

2x2 + 5x - 3 = 0

Δ = 5² - 4.2.(-3) = 25+24 ==> 49

x = - 5 +/- 7 ==> x = - 5 +/-7
           2.2                      4

x1 = 2  ; x2 = - 3 
        4