Решите уравнение и найдите дискриминант. Помогите Пожалуйста
1)16x^2-2x-5=0
2)28x^2-36x+11=0
3)-49x^2+21x-2=0
4)3x^2+10x+7=0
5)-7x^2-4x+11=0
6)-23x^2-22x+1=0
7)3x^2-14x+16=0
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