Equation of parabola is .
<u>Step-by-step explanation:</u>
The vertex form of the parabola is given as,
where (h,k) is the vertex of the parabola.
If the parabola must be symmetric about x = -10 then the axis of symmetry must be x = -10.
To execute this, h should be -10, and it was plugged in the vertex form of the parabola, a and k may be any real number.
So the equation can be written as,
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