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x = -3 LUB x= -7
b) -x kwadrat-6x+16=0
-x^2 -6x + 16 = 0
Δ=36+64=100
√Δ=10
x=(6-10)/(-2)=2 LUB x=(6+10)/(-2)=-8
c) -2x kwadrat+3x+2≥0
-2x^2 + 3x + 2 ≥ 0
Δ=9+16=25
√Δ = 5
x = (-3-5)/(-4) = 2 LUB x = (-3+5)/(-4) = -0,5
(x-2)(x+0,5) ≥ 0
a = -2 <0 ramiona skierowane w dół
x∈ <-0,5; 2>
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