Question

A concave mirror produces a magnification of +4 . where the object should be placed?

Answer 1

Concave lens produces both real and virtual images.
when the image is real, it is inverted so the magnification is negetive.
but when the image is virtual, it is erect and the magnification is positive.
there is only one case in concave mirrors that it produces virtual and erect images, that is when the object is kept between focus and the pole of the mirror.

As here the magnification is positive, the object must be placed between the focus and pole of the mirror