Question

h)2x²+7x+5=0?

i)3x²+9=0?

j) 4x²+6x=0?

Answer 1

h)2x²+7x+5=0?

 

49 - 40

delta  = 9                                 X = -7 + ou - 3 /4

x¹ = -1

x² = -2             S{-1,-2}

 

 

i)3x²+9=0?

X² = -9/3

X² = -3

X = + ou - raiz de 3        S{ + raiz de 3, menos raiz de 3}

 

j) 4x²+6x=0?

 

36 - 0

36                                  X = -6 + ou - 6 / 2

 

x¹ =  0

x² =  -6

 

S{0, -6}