Question

2x²-3x-2=0 qual a resposta ? equaçoes do 2 grau 

Answer 1

2x²-3x-2=0

a = 2        b = -3        c = -2
Δ = b² -4.a.c
Δ = (-3)² -4.(2).(-2)
Δ = 9 + 16
Δ = 25

x = -b ± √Δ
         2.a

x = -(-3) ± √25
           2.2

x = +3 ± 5
         4

x' = 3+5  = 8 = 2
        4       4

x" = 3-5  = -2  ÷ 2 =  -1
        4        4  ÷ 2      2

S{-1/2 ; 2}

Answer 2

2x²-3x-2=0
3+-√9-4.2.(-2)/2.2
3+- √9+16/2.2
3+-5/4
x1=3+5/4=8/4 =2
x2=3-5/4=-2/4=-1/2
S={-1/2,2}