Resposta :

AlessandraAzevedo

2x² +5x+3=0                               x= -b /2.2

A=2, b= 5 e c=3                           x= -(-5 /4

Δ= b²-4*a*c                         x = 5 /4

Δ = 5²-4*2*3                        x’ = 5+1/4 = 6/4 ( simplifica por 2 ) e x’= 3/2

Δ= 25-24

Δ=1                               x’’= 5-1/4 = 4/4 = 1

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