Question

Ex 17 si 19 !!!!!
CAT SE POATE DE REPEDEE ..VA ROG!!

Answer 1

17a)x²+2x+3=0
Δ=4-12=-8
Δ<0
x∈Ф

b)x²+6x+11=0
Δ=36-44=12
x1=(-6+2√3)/2=2(-3+√3)/2=-3+√3
x2=-3-√3

c)x²+12x+39=0
Δ=144-156=-12
Δ<0
x∈Ф

d)4x²+12x+13=0
Δ=144-208=-64
Δ<0
x∈Ф

e)9x²+24x+19=0
Δ=576-684=-108
Δ<0
x∈Ф

f)25x²+30x+17=0
Δ=900-1700=-800
Δ<0
x∈Ф

19)a)x¹⁶-1=(x⁸)²-1=(x⁸-1)(x⁸+1)
b)x⁶⁴-1=(x³²)²-1=(x³²-1)(x³²+1)
c)x²⁵⁶-1=(x¹²⁸)²-1=(x¹²⁸-1)(x¹²⁸+1)
d)x¹°²⁴-1=(x5⁵¹²)²-1=(x⁵¹²-1)(x⁵¹²+1)

Answer 2

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