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a)4x^4 + 13x² +3 = 0x²=y4y² + 13y + 3 = 0 Δ = 169-48Δ = 121x = 13 +/- 11 / 8 x1 = 13+11/8 = 24/8 =3x2= 13-11/8 = 2/8 = 0,25S = {0,25;3}
b) = 5( [tex] \sqrt{x-1} [tex] ) ² = (5)²
x-1=25
x=26
c)3x²+5x-2
Δ = 25 +24
Δ = 49
x = -5 +/- 7 /6
x1 = -5+7/6 = 2/6 = 0,33...
x2 = -5-7/6 = -12/6 = -2
S = {0,33...}
d)x²+4x+21 = 0
Δ = 16 - 84
Δ = -68
S ={Ф}
b) = 5( [tex] \sqrt{x-1} [tex] ) ² = (5)²
x-1=25
x=26
c)3x²+5x-2
Δ = 25 +24
Δ = 49
x = -5 +/- 7 /6
x1 = -5+7/6 = 2/6 = 0,33...
x2 = -5-7/6 = -12/6 = -2
S = {0,33...}
d)x²+4x+21 = 0
Δ = 16 - 84
Δ = -68
S ={Ф}
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