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The first volume of grade nine, the whole exercise book of mathematics. The equation method of the first kind of unary quadratic equation is the sixth and seventh questions.
Question 6 is D because you used B? -4ac returns that all values except d are less than 0.
Question 7: Do you choose A because you are using B? If -4ac is calculated and equals to 0, then there is a real number root or two equal real number roots.