How the equation we study today is called , equation , 1st grade equation, 2nd grade equation , 3rd grade equation , in the equation a≠…, 0, 1, 3, 2, Δ can be , positive , negative , zero , all the previous , nothing from the previous , if Δ>0 it has , two different roots  , one root , no roots, 3 roots, if Δ=0 it has , one root, 3 roots, 1 double root , 0 roots, if Δ<0  it has , one root , 0 roots , 4 roots , 2 roots , What we use in order to find the Δ, our mind , internet , a type we have learned , nothing , Δ must be , number , letter , number and in some times letter , all the previous .

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