Question

resolva: 4x²+3x-1=0
b) 2x²-4x=0

Answer 1

a)4x²+3x-1=0

Δ= b²-4.ac

Δ= (3)²-4.4.(-1)

Δ= 9 + 16

Δ= 25

x = – b ± √∆/ 2∙a

x = -3 ± √25/2∙4

x = -3 ±5/8

x' = -3+5/8 = 2:2/8 :2 =  2 /4

x'' = -3 -5/8 = -8/8 = -1

         

b) 2x²-4x=0

X(2x – 4)