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-2x²+2x+1=0
Δ=4+4*2=12
√Δ=2√3
x=(-2-2√3)/(-4) = (1+√3)/2 v x=(1-√3)/2
b)
x²+10x+6-2x+1≥0
x²+8x+7 ≥0
x² + x + 7x +7 ≥ 0
x(x+1)+7(x+1) ≥ 0
(x+1)(x+7) ≥ 0
m.z. x=-1 v x=-7
_____-7_____-1_____>x
+ + 0 _ _ 0 + +
Odp. x∈(-∞, -7> u <-1, +∞)
b)