Linear magnification produced by spherical mirror is +3 state the type of mirror used and position of object with respect to pole of mirror.

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Solution

we know,
linear magnification = height of image / height of object .

+3 = height of image / height of object

here we can see that height of image is 3 times of height of object . this is possible in concave mirror , because in concave mirror , magnification is greater then 1 . not in convex mirror .
Since magnification is positive it means image will be erect.so object must place between Focus and pole of the mirror which will give virtual erect and enlarged image.
Answer
Concave mirror

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