Question

3x elevado a 2 menos x + 4 = 6

Answer 1

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3x²-x+4=6

3x²-x+4-6=0

3x²-x-2=0

a=3
b=-1
c=-2

Δ=b²-4ac
Δ=(-1)²-4(3)(-2)
Δ=1+24
Δ=25

x=(-b±√Δ)/2a = [-(-1)±√25)/6    = (1±5)/6

x'=(1+5)/6=6/6=1

x"=(1-5)/6=-4/6 = -2/3

S={ -2/3,1}