Q. What is the axis of symmetry of the parabola x=21(y+3)2+5?
Equation of the parabola: We have the equation of the parabola: x=21(y+3)2+5This is a horizontal parabola because the variable y is squared and x is isolated on one side of the equation.
General form of a horizontal parabola: The general form of a horizontal parabola is x=a(y−k)2+h, where (h,k) is the vertex of the parabola.By comparing the given equation x=21(y+3)2+5 with the general form, we can identify the vertex (h,k).
Identifying the vertex: From the equation x=21(y+3)2+5, we can see that the vertex (h,k) is (5,−3).This means h=5 and k=−3.
Axis of symmetry: The axis of symmetry for a horizontal parabola is a vertical line that passes through the vertex. Therefore, it has the equation y=k.Substituting the value of k, we get the axis of symmetry as y=−3.
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