Question

13 – 2x – 15x² = 0
( ) -2 , 15 ∕ 13
( ) -5 ∕ 2 , 1
( ) -2 , -5
( ) -1 , 13 ∕ 15
( ) 15 ∕ 13 , -7

Answer 1

Resposta:

S= { -1, 13/14}

Explicação passo-a-passo:

-15x²-2x+13=0

a= -15, b= -2, c=13

∆= (-2)²-4x(-15)x13

∆= 4+780

∆= 784

x= - (-2)+-√784/2(-15)

x= 2+-28/ -30

x'= 2+28/-30

x'= 30/-30

x'= -1

x"= 2-28/ -30

x"= -26/ -30

x"= 13/15

S= { -1, 13/14}