On the solution of the equation x square + ax + B = 0 of X, when a and B satisfy what conditions, the solution of the equation contains one element? Two elements? It needs to be detailed

When △ = a ^ 2-4b = 0, the equation has a solution, that is, the solution of the equation contains one element
When △ = a ^ 2-4b > 0, the equation has two solutions, that is, the solution of the equation contains two elements

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