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Find the magnification of the image

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A candle is placed 15 cm from the vertex of a concave mirror that has a focal length of 10 cm. Find the magnification of the image.

M = –ID/OD = –15/OD
1/OD + 1/ID = 1/FL
 
1/OD + 1/15 = 1/10
 
1/OD = –1/15 + 1/10
 
M = –15(1/OD) = –15(–1/15 + 1/10)
 
M = 1 – 15/10 = –0.5
 
The image will be in front of the mirror, inverted, and half the size of the candle.