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2x²+7x-4≥0
Miejsca zerowe:
Δ=7²+4*2*4=49+32=81
√Δ=9
x=1/4 *(-7-9)=-4 v x=1/4 *(-7+9)=1/2
______-4______1/2_______>x
+ + 0 _ _ 0 + +
Odp. x∈(-∞,-4> u <1/2, +∞)