SOLUTION: the vertex of the parabola x2+6x+3y+r=0 is on the x-axis. Find r.
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Question 1017075: the vertex of the parabola x2+6x+3y+r=0 is on the x-axis. Find r.
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Vertex of a parabola on the x-axis means ONE root only, REAL, and therefore
the discriminant is 0.
Discriminant here is
You want to equate this expression, the discriminant, to 0.
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