Question

resolva as equações a seguir:
a) 3x²-2x-1=0
b) y²-7y+6=0
c) 16x²+8x+1=0
d) 5x²-4x+2=0

Answer 1

a)3x²-2x-1=0
d=b²-4ac
d=(-2)²-4.3.(-1)
d=4+12
d=16
x=-b±√d/2a
x=-(-2)±√16/2.3
x=2±4/6
x'=2+4/6=6/6=1
x"=2-4/6=-2/6=-1/3